Tom McNally's Amps ...
Amplifiers I've built or rebuilt.
Output tubes include 1626, 2A3, 300B, 6B4G, 6EM7, 6T9, 13EM7,
EL-34, EL-84/6BQ5, 6550, 7591, 832A, KT-90 ...

Check my eBay listings for amps for sale ... tomsnj on eBay
If you have questions or need some help, please email: tom@mcnally.cc
The forums at DIYTube.com are a great resource also.

Click on any picture for a larger image !

DIYTube ST-35 / Triode Electronics Stainless Steel Chassis

17 watts per channel
DIYTube ST-35 rev. D 12AX7/12BH7 - EL-84 Outputs - SS Rectifier
Built 06/13/2007

Built on the hot Triode Electronics
Stainless Steel chassis

DynaClone Transformers
from Triode Electronics

JJ EL-84s and EH 12AX7 and 12BH7

Shannon Parks DIYTube
rev D ST-35 Board

April 2008 Mono Darling (# 3) - 1626 Single Ended Triode

3/4 of a watt
12SL7 Driver - 1626 Output - SS Rectifier
Built 04/17/2008

Built on a Hammond 12x8x3 chassis

1943 vintage 1626
NOS GE 12SL7 driver

Gold RCA
Gold binding posts
8 or 16 ohms

Hammond 269EX Power Transformer
Hammond 125ESE Output

April 2008 Darling # 2 - 1626 Single Ended Triode

3/4 watt per channel
12SL7 Driver - 1626 Outputs - SS Rectifier
Built 04/10/2008

Built on a Hammond 12x8x3 chassis

1943 vintage 1626's
JAN RCA 12SL7 driver

Gold RCA's
5 way binding posts
IEC power connector / Fuse

Hammond 269EX Power Transformer
Edcor XSE15-8-5K Outputs

April 2008 Darling # 1 - 1626 Single Ended Triode

3/4 watt per channel
12SL7 Driver - 1626 Outputs - SS Rectifier
Built 04/07/2008

Built on a Hammond 12x8x3 chassis

Gold RCA's
5 way binding posts
IEC power connector / Fuse

1943 vintage 1626's
JAN RCA 12SL7 driver

Hammond 269EX Power Transformer
Edcor XSE15-8-5K Outputs

JE Labs EL-34 Single Ended Stereo Amp

8 watts per channel
6SL7 Drivers - EL-34 Outputs - GZ-34 Rectifier
Built 04/05/2008

Built on a Hammond 12x8x3 chassis

Tung-Sol 6SL7's Tesla EL-34's and JJ GZ-34

Hammond 272HX Power Transformer
and Hammond 193G Choke

Edcor XSE15-8-5K Outputs
ReliableCap PPFA Coupling Caps

"Darling XLR" 1626 Single Ended Triode

3/4 of a watt per channel
12SL7 - 1626 Outputs - SS Rectifier
Finished 02/09/2008 (sold)

Selectable RCA or
Balanced XLR inputs

Black Hammond 12x8x3
steel chassis
1943 vintage 1626's !
RCA 12SL7 driver

Unknown small outputs,
269EX Power Transformer,
156R Choke

This amp has a pair of XLR connectors feeding UTC 500 to 500 ohm input transformers,
and balanced XLR outputs. It will be used as a tube effect box in a pro recording studio.
The output transformers are a NOS pair of the type used in cheap guitar amps, or small
tube radios from the 60's ... for that classic tube sound.

6T9 Compactron Single Ended Stereo Amplifier

4 watts per channel
6T9 Tubes
Built 11/12/2007

Hammond 12 x 8 x 3 chassis

6T9 Compactron tubes

Hammond 269EX Power Transformer
Edcor XSE15-8-5K Outputs

Similar to the design by Bob Armstrong and
available as a kit or bare-board at Spare Time Gizmos

DIYTube ST-35 / Triode Electronics Stainless Steel Chassis

17 watts per channel
DIYTube ST-35 rev. D 12AX7/12AU7 - EL-84 Outputs - SS Rectifier
Built 11/07/2007

Built on the new Triode Electronics
Stainless Steel chassis

DynaClone Transformers
from Triode Electronics

Fingerprints, dust and
un-raked leaves by Tom McNally

Shannon Parks DIYTube
rev D ST-35 Board

DIYTube get*set*go 6B4G Single Ended Triode

3 watts per channel
Sovtek 6SL7 Driver - Sovtek 6B4G Outputs - 6AX5 Rectifier
Built 03/15/2007
Check eBay for an amp for sale now

click picture for more ...

The new DIYTube get*set*go Single Ended Triode amplifier !
Superb SET sound, and available as an easy to assemble
circuit board, with parts sourcing information, or I can
build you a getsetgo ! EMail for more info - link below.

First Fall "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 10/13/2007 (headed to Singapore)

This is the Classic Darling
design by Bob Danielak
using James 6113HS
Output Transformers

1943 vintage 1626's !
Sylvania 8532 drivers

Hammond 12x8x3
black steel chassis
Gold RCA jacks and
stainless hardware
IEC Power Connector

Hammond 369EX
Power Transformer,
and Hammond 156R Choke
strappable for 100 to 240 volts

May's Third Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 05/08/2007 (sold)

This is the Classic Darling
design by Bob Danielak
using James 6113HS
Output Transformers

1943 vintage 1626's !
Sylvania 8532 drivers

Hammond 12x8x3
black steel chassis
Gold RCA jacks and
stainless hardware
IEC Power Connector

Hammond 369EX
Power Transformer,
and Hammond 156R Choke
strappable for 100 to 240 volts

Reliable Capacitors
Audio Cap
coupling capacitors
and high quality bypasses

Another May Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 05/05/2007 (sold)

This is the Classic Darling
design by Bob Danielak
with Edcor XSE15-8-5K
Output Transformers

1943 vintage 1626's !
Sylvania 8532 drivers

Hammond 12x8x3
black steel chassis
Gold RCA jacks and
stainless hardware
IEC Power Connector

Hammond 269EX
Power Transformer,
and Hammond 156R Choke

Another Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 05/04/2007 (sold)

This is the Classic Darling
design by Bob Danielak
with Edcor XSE15-8-5K
Output Transformers

1943 vintage 1626's !
Sylvania 8532 drivers

Hammond 12x8x3
black steel chassis
Gold RCA jacks and
stainless hardware
IEC Power Connector

Hammond 369EX
Power Transformer,
and Hammond 156R Choke
capable of operating on
100/110/120/200/220/240 VAC 50/60 Hz

A Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 04/25/2007 (sold)

This is the Classic Darling
design by Bob Danielak
with Edcor XSE15-8-5K
Output Transformers

1943 vintage 1626's !
Sylvania 8532 drivers

Hammond 12x8x3
black steel chassis
Gold RCA jacks and
stainless hardware
IEC Power Connector

Hammond 269EX
Power Transformer,
and Hammond 156R Choke

A Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 04/23/2007 (sold)

This is the Classic Darling
design by Bob Danielak
with Edcor XSE15-8-5K
Output Transformers

Hammond 12x8x3
black steel chassis
Gold RCA jacks and
stainless hardware
IEC Power Connector

1943 vintage 1626's !
Sylvania 8532 drivers

Hammond 269EX
Power Transformer,
and Hammond 156R Choke
Angela Coupling Caps

A Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 04/21/2007 (sold)

This is the Classic Darling
design by Bob Danielak
with James 6113HS
Output Transformers

1943 vintage 1626's !
Sylvania 8532 drivers

Hammond 12x8x3
black steel chassis
Gold RCA jacks and
stainless hardware
IEC Power Connector

Hammond 369EX
Power Transformer,
and 156R Choke
Switchable 120/240 Volts

A Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 04/12/2007 (sold)

This is the Classic Darling
design by Bob Danielak
1943 vintage 1626's !
Sylvania 8532 drivers

Black Hammond 12x8x3
steel chassis
Gold RCA jacks and
all stainless hardware
IEC Power Connector

Hammond 125CSE Outputs,
269EX Power Transformer,
156R Choke

A Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 04/10/2007
(sold)

This is the Classic Darling
design by Bob Danielak

Black Hammond 12x8x3
steel chassis
Gold RCA jacks and
all stainless hardware
IEC Power Connector

1943 vintage 1626's !
Sylvania 8532 drivers

Hammond 125E Outputs,
269EX Power Transformer,
156R Choke

Classic Style !

"Darling" 1626 Single Ended Triode

3/4 of a watt per channel
12SL7 - 1626 Outputs - SS Rectifier
Built 04/05/2007 (sold)

Darling variant schematic below

Gold RCA jacks and
all stainless hardware

Black Hammond 12x8x3
steel chassis
1943 vintage 1626's !
CBS 12SL7 driver

Hammond 125E Outputs,
269EX Power Transformer,
156R Choke

A Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 04/01/2007 (sold)

This is the Classic Darling
design by Bob Danielak

Black Hammond 12x8x3
steel chassis
1943 vintage 1626's !
Sylvania 8532 drivers

Gold RCA jacks and
all stainless hardware
Hammond 125E Outputs,
269EX Power Transformer,
156R Choke

6EM7 Push Pull

10 watts per channel
6EM7 Driver/Outputs - GZ-34/5AR4 Rectifier
Finished 03/16/2007

Built on 12"x8"x3"
black Hammond chassis
NOS GE 6EM7 Tubes

4 and 8 ohm connections
Hammond 1608 output and
Hammond 270EX Power
transformers

Hammond 156R Choke
Big capacitors - no hum

details - note cathode resistor
and CCS next to it
The 6EM7 is a unique old TV tube with an input section similar to
a 6SL7 and an output section similar to a 2A3. This circuit was
designed by Shannon Parks and uses an LM-234Z constant current source.

DIYTube ST-35 / Soundtastick Chassis

17 watts per channel
DIYTube ST-35 rev. D 12AX7WC/12BH7EH - EL-84 Outputs - SS Rectifier
Built 03/09/2007 (sold)

Built on a Soundtastick chassis

DynaClone Transformers
from Triode Electronics

Shannon Parks DIYTube
rev D ST-35 Board

A Classic "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
8532 Drivers - 1626 Outputs - SS Rectifier
Built 03/03/2007 (sold)

This is the Classic Darling
design by Bob Danielak

Black Hammond 12x8x3
steel chassis

Gold RCA jacks and
all stainless hardware

1943 vintage 1626's !
Sylvania 8532 drivers

Hammond 125E Outputs,
269EX Power Transformer,
156R Choke

I built this to see if the sound was different than my 12SL7 driver versions.
They both sound great !

DIYTube get*set*go 6B4G Single Ended Triode

3 watts per channel
Sovtek 6SL7 Driver - Sovtek 6B4G Outputs - 6AX5 Rectifier
Built 02/24/2007

Welborne 10.5 x 14.5 chassis

Front Panel Express top plate

James Output Transformers
from Euphonia Audio

PA-774 Power Transformer
from Triode Electronics
with Nickel Plated covers
from Uncle Ned's Tubezone

Shannon Parks SET board
from DIYTube

Clean layout like other
DIYTube amps

This amp sounds SWEET ! It's the first SET design from Shannon Parks.
I had the pleasure of building the first one, and it is amazing !
Boards will be available in March 2007, along with the same high
quality manual, parts list and support DIYTube is famous for.
The 6B4G is a 6 volt octal base version of the 2A3, available
NOS or new manufacture by Sovtek.

DIYTube ST-35 / Hammond Black Chassis

17 watts per channel
DIYTube ST-35 rev. D 12AX7/12AU7 - EL-84 Outputs - SS Rectifier
Built 11/25/2006

Hammond 12x8x3 chassis

JJ Tubes

DynaClone Transformers
from Triode Electronics

Shannon Parks DIYTube
rev D ST-35 Board

This was a nice one evening project I built for someone who bought the parts.

Another Little "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
12SL7 Driver - 1626 Outputs - SS Rectifier
Built 11/22/2006 (sold)

Built in a small 5"x8"x3"
aluminum box
NOS RCA 1626 Tubes
NOS Raytheon 12SL7

Input Jacks, Speaker connections
and power on the back

Hammond 125E
Output Transformers

Gold Sockets from
Angela Instruments

See details, credits and schematic below.

A Little "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
12SL7 Driver - 1626 Outputs - SS Rectifier
Completed 11/16/2006 (sold)

Built in a small 5"x8"x3"
aluminum box

Input/Speaker connections and power

NOS 1943 1626 Tubes
NOS RCA 12SL7

Output transformers are
Hammond 125E

See details, credits and schematic below.

DIYTube ST-35 / Soundtastick Chassis

17 watts per channel
DIYTube ST-35 rev. D 12AX7/12AU7 - EL-84 Outputs - SS Rectifier
Completed 11/14/2006

Built on a Soundtastick chassis

DynaClone Transformers
from Triode Electronics

Nickel Plated Transformer covers
from Uncle Ned at Tubezone

The chrome chassis and
nickel transformers look hot !

Shannon Parks DIYTube
rev D ST-35 Board

Updated pix on 03/10/07 with transformer covers and new binding posts, except board pic

DynaClone 60 watt Monoblocks

60 watts per channel
DIYTube Poseidon Driver 12AX7/12AU7 - KT-90EH Outputs - GZ37 Rectifier
Completed 4/09/2006 (sold)

Built on chrome repro chassis
DynaClone Transformers
from Triode Electronics

Shannon Parks DIYTube
Poseidon Driver Board

Russian KT-90s

Mullard GZ-37

Bookends ! "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
12SL7 Driver - 1626 Outputs - SS Rectifier
Completed 2/28/2006 (sold)

Very cool looking design
idea by Tom Magalhaes
I built this pair for him

Note the ground buss
this one has a mono switch
for bridged operation

Hammond 125E Outputs,
269EX Power Transformer,
156R Choke. Angela coupling caps.

The back, with covers off.

See details, credits and schematic below.

RCA 832A Push Pull Stereo Amp

6 watts per channel
12AT7 Drivers - 832A Outputs - 5AR4/GZ34 Rectifier
Completed 2/10/2006
From AudioHobbyist.com

Built on a Hammond 12x8x3 Black Chassis

Output transformers are Hammond 125E's

Another angle showing the shape of the 832A's


Another two day project. I went with a tube rectifier and choke in
the power supply. It runs kind of hot, so for now I am using a
Whisper Fan on it ... blowing that nice transformer smell around.
The tubes are Dual Beam Power tubes with plate pins on top, and go
in ceramic "Septar" sockets - all in all - very cool looking !
The amp sounds nice - very clear and loud, not muddy.

Another "Darling" 1626 Single Ended Triode

3/4 of a watt per channel
12SL7 Driver - 1626 Outputs - SS Rectifier
Completed 1/5/2006 (sold)

Built on a Hammond 12 x 8 x 3
black steel chassis

Speaker connections and power

Output transformers are
Hammond 125CSE

I built this Darling for Tom Magalhaes of Tracy, CA.
He says it sounds great on a pair of Lowthers, plenty
of volume and no hum. He was amazed that 3/4 of a
watt could sound so good.
If you're in that area, stop into his restaurant Magellan's Restaurant

See details, credits and schematic below.

"Darling" 1626 Single Ended Triode

3/4 of a watt per channel
12SL7 Driver - 1626 Outputs - SS Rectifier
Completed 12/24/2005
Inspired by Bob Danielak's "Darling" design and Johannes G. LeBong's 5691/1626 "Darling" amp

Built on a surplus 16.5 x 3.5 x 4
rack mount chassis

1626's and 12SL7 are
from Vacuum Tubes Inc.

Output transformers are
Hammond 125E's from
Angela Instruments

High voltage power supply
and filament doubler


Schematic made with
TubePad

1626's are from 1943 !
I built this bad boy in 2 days. The amp was
finished and just waiting for the tubes to arrive.
They came in the Christmas Eve mail !
I washed 62 years worth of dust from the 1626's,
plugged them in, and 12 seconds later this little
amp was playing and sounding very, very nice !
Take a look at The Darling Club for many great
and artistic examples of Darling amplifiers.
I guess mine is very industrial looking.

Dynaco SCA-35

about 17 watts per channel
7199 Drivers - 6BQ5/EL84 Outputs - SS Rectifier
Vintage: 1964

This bad boy sounds great
but runs pretty hot ! Note the fan.

I retubed this amp with a quad of JJ EL-84's and
put the 7199's from the recently stripped Heathkit AA-100 in it.

DIYTube ST-70 Driver Based Clone

about 35 watts per channel
12AU7 and 12AX7 Drivers - 7591 Outputs - GZ34/5AR4 Rectifier
Vintage: 2005
I finished this amplifier on 12/03/05
Update - I converted it to use 6BG6G's on 03/02/07

Built on a Yaeger Audio 17 x 12 x 2
black steel/aluminum chassis

Heathkit AA-100 transformers
and a DIYTube Driver Board

The power supply is built on a
turret board bought on eBay when
CCA Transmitters went bankrupt

I replaced the crappy
tube sockets with better ones
and converted to 6BG6G's

I bought a Heathkit AA-100 about 5 years ago, and recently
decided to restore it. I bought a quad of JJ 7591's BEFORE I saw
how nasty the output circuit board was in the amp. In fact, the
whole design of the AA-100 turned me off to the project. I am
using a DIYTube ST-70 driver board to drive the 7591's
and the Heathkit power and output transformers and rectifier.
This amp sounds sweet ! Check out DIYTube.com
for great forums with plenty of friendly advice and conversation.

Heathkit AA-151 Integrated EL-84

14 watts per channel
2-6EU7, 2-6AU6, 2-6AN8, 4-EL84/6BQ5, 1-GZ34/5AR4
Vintage: 1962?

It plays with a few buzzes and
hums and scratchy pots

some new tubes and sockets
and capacitors will fix that

I bought this on eBay a couple of years ago, and haven't done much with it yet.
It doesn't sound too bad, but the cheezy phenolic wafer tube sockets in the
preamp section have to go. Someone did a little repair work on it already,
and the basic build isn't bad. The basic design and chassis is decent.
On the SL-1200, Crosby, Stills and Nash stolen from WMGM, 01/23/1973 - and it's not
too scratchy even though it's been the test disc for my VW Bus Record Player !

Left Side

Right Side
Sorry - this schematic is big and not easily scanned !

JE Labs Simple 45/2A3 Single Ended Triode

2.5 watts per channel
6SL7 Drivers - 2A3 Outputs - 5Z3 Rectifier
Vintage: 2005 (sold)
I built this from Joseph Esmilla's schematic
with a couple of minor changes

Built on a Hammond 17 x 10 x 4
black wrinkle finish chassis

Eastern Audio transformers
Oil filter caps from Angela Instruments
Hovland MusiCap coupling caps
from Handmade Electronics



13EM7/15EA7 (6EM7) Single Ended Triode

1 watt per channel
15EA7 - Dual Triode (Driver/Amp) Silicon Rectifiers
Vintage: 2005
Inspired by the "MiniBlok"by Fred Nachbaur and by the schematic at AudioHobbyist.com

Built on a recycled diecast
aluminum box - the front panel
holes were there, hence the imbalance

Hammond 125CSE audio transformers
from Angela Instruments
and some leftover parts

This little amp sounds as good as my 2A3 amp and 300B amp !
I have a pair of Klipsch KSB 3.1 speakers (96dB/1W@1M sensitivity) in my bedroom,
and this little one watt per channel amp is way loud with plenty of solid bass.
It doesn't have a conventional power transformer, instead, I am using two 12.6 VAC
filament transformers in parallel, powering the two 13 volt .45 amp filaments
and a reverse connected 12.6 VAC > 240 VAC transformer for the plate voltage.
I can hear a little bit of hum, so maybe I'll add some more capacitance to the
plate supply. Except for the tubes (eBay) and audio transformers (Angela)
I used parts I had from left over from other projects. I guess the next project
will be to figure out why the other amps don't sound a lot better than this one !


Time Bandit 300B Single Ended Triode

9 watts per channel
6SN7 Drivers - 300B Outputs - 83 Mercury Vapor Rectifier
Vintage: 2004
I built this from Raymond Koonce's schematic
with a couple of minor changes

Built on a Hammond 17 x 14 x 4
black chassis

Vintage RCA Meter measures
all DC Voltages and Currents

Hammond Transformers
contribute to 60 lb weight !

Electro Harmonix 300Bs
RCA 83 Mercury Vapor Rectifier
NOS GE 6SN7 GTB Drivers

Hammond Chokes and Filament
Transformers and Oil Capacitors
from Angela Instruments
Amperite Time Delay
Relay for Warmup
(schematic)



DIYTube Stereo 35 - ST 35 Clone

17 watts per channel
12AX7/12AU7 Drivers - 6BQ5 (EL-84) Outputs - Silicon Rectifiers
Vintage: 2003
Built from Shannon Park's beautiful
circuit board and all new parts.

Built on a Hammond 12 x 8 x 3
aluminum chassis

Board from DIYTube.com

Hammond 1650E Outputs
and 272FX Power Transformer

I planned for a three
input switcher - still to come !



Dynaco MK-III

60 watt monoblock amplifier
Two 6550 tubes in PP
Vintage: 1960 (kit)

Amp with Triode Electronics
replacement driver board

Closeup of driver board
2 - 12AU7/ECC82

Brother and Sister !



Dynaco ST-70

35 watts per channel
Two EL-34 tubes per channel in PP
Vintage: 1965 (kit)

Amp with Triode Electronics
replacement driver board

Closeup of driver board
2 - EF86 1 - 12AU7/ECC82

Back in the cage !


Click for 1965 Lafayette Catalog listing !

Dynaco ST-35

17 watts per channel
Two EL-84 tubes per channel in PP
Vintage: 1966 (factory wired)

About as big as a loaf of bread

2 Penta Labs EL-84/6BQ5
GE 7247 driver/phase splitter

Can capacitor replaced
with modern radials on a PCB


Click for 1965 Lafayette Catalog listing !

This ST-35 got me started with tube amps in about 1995.
I visited my friend Jim McCann, who was working at a radio station in Pittsburgh,
and had purchased a Dynaco ST-70 and PAS from an ad in the newspaper for about
$ 25 and cleaned up and restored them. The sound was magical ! I told my late
friend Don Powers about it, and the next day he showed up at my door dragging
this poor little ST-35 by the power cord. It had once lived on top of the
transmitter of radio station WDVR (aka WEAZ and WBEB) in the Roxboro "antenna
farm" in Philadelphia. I did some quick repairs, with new Penta Labs 6BQ5's
(you could still buy them at Kearn's Electronics locally !) and a pair of
7247's brought home from work. (haha seriously) I replaced the bad can
electrolytic with a little circuit board meant to replace the can capacitor
in an ITC Premium Line tape cartridge machine.

Who needs Gold RCA Jacks and Gold 5 Way Binding Posts ! I just hooked
this amp up for the first time in awhile and it still sounds great.
I'd like to say goodbye to Dave Kurtz, founder and original Chief Engineer
of WBEB, who passed away on Thanksgiving Day, 2005.

Dynaco Brochure from the Early Sixties

click for full size image - average 350 k !

Cover -
FM-3 Tuner
PAS-3 Preamp

FM-1 Mono
FM-3 Stereo
Tuners

PAM-1 Mono
PAS-2 Stereo
PAS-3 Stereo
Preamplifiers

Stereo 35
Stereo 70
Power Amplifiers

SCA-35
Control Amp

Mark IV 40 watt
Mark III 60 watt
Mono Amplifiers
Transformer Info


Velleman K-4000

95 watts per channel
Four EL-34 tubes per channel in PPP
Vintage: 1997 (kit)

Power Amp sits on
matching preamp
(preamp is solid state
with remote control)

Eight Svetlana EL-34 tubes

Inside ...


updated June 14, 2008 Any schematics may be copyright the original designers and I make no claims to them, they are shown here for educational purposes.


Angela Instruments - Antique Electronics - DIYTube - Euphonia Audio - Handmade Electronics - Triode Electronics - TubeZone