Help Me Decide on a New Audio Project and/or Web Page
Last Update 1/11/98
Photos of some of my stuff:
Photo 1 Shows the amp section of the
Beast during power and distortion
measurements. Volume control and input jack on front. Notice feedback cable connected
to 1/8 in. jack on top surface to left of the input tubes.
Photo 2 shows the Complete Beast set-up.
The power supply chassis and output transformer are simply laid on the workbench next to
the amp and scope. Notice the X/Y trace on the scope. Not too shabby, eh?!
This is at 100W output !!!
Ultramini 6j6/6aq5 guitar amp and Eimac 250TH in background.
Photo 3 Shows the guts of the amp section.
Not a whole heck of a lot in there!
Notice small muffin fans under each output tube.
Photo 4 is a shot of my Push-Pull 2A3 Amp .
Photo 5 is another shot of my Push-Pull 2A3 Amp .
Photo 6 is a shot of a DC coupled, Single-Ended, 2A3 amp
I built a while back. Haven't made up a web page for it. In fact I've since recycled this
Chassis for the Convertible SE SV572 amp. The 2A3 amp was unique
in that it used a single stage choke loaded driver.
Photo 7 is a shot of a small Stereo SE amp I built.
See if you can guess the tube line-up....
Notice the 7-pin mini driver tube. This amp puts out <1W, but it sounds soooo good....
Photo 8 is another shot of the mystery amp in Photo 7.
More Photos 1/11/98
SE45/2A3 is a shot of my newest SE 2A3/45 amp.
This amp is using a 2HQ5 7-pin mini triode per channel as a single stage driver.
How do you like the "Stone" finish ?
SV811 #1 is a shot of my
Single Ended SV811-10 Amp . Notice that SV572-10's are instaled in
this photo. I like the contrast of the Funky Green top plate in the blonde
Here's a neat little push pull 1626 amp. It uses a single
12AU7 for both channels at the input. This is plate loaded with standard resistors,
but cap coupled to some small signal interstage transformers for phase-splitting
and driving the 1626's. The 12AU7 is not my favorite input/driver tube, but it seems
to be the best match for this circuit. (tried 5687, 5965, 12AT7, etc...)
Here is a compact line preamp that I built using
submini 6111 dual triodes. Topology is simple gain stage direct coupled to
White Follower Output. One Knob is input selector, other is Volume.
Since my last update around 6/97 I've done quite a bit. Just haven't had the time to write it all up and post it here.
Which of the following would YOU suggest I put on my site:
1. mini-line-stage using the stubby 5670
2. SE 812A amp using step-down transformer and cathode drive!!!
3. Push-Pull 2A3 amp using directly heated twin pentode driver.
4. Direct Coupled SE 2A3 amp - various driver options
5. SE Stereo amp using Eimac 250TH
6. Computer Modelling Vacuum Tubes using PSPICE, SABER, and MATHCAD
7. Circlotron-type bridge amp using 6AS7's .
8. Killer Guitar Practice/Light Jam Amp
9. ultra-mini guitar amp
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This page, and all contents, are Copyright (C) 1997 by Bob. D.