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Single Ended Triodes (SETs), the ultimate tube lovers dream.

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Original Message

BB Proof 2A3 DC

Posted by Garg0yle on December 5, 2014 at 20:22:08:
This is a continuation thread branched from a previous discussion here:
http://www.audioasylum.com/cgi/vt.mpl?f=set&m=77251

Paul generously offered to conjure up a schematic for us to use.

Here are tentative parameters for this amp:

Octal driver
2A3 output
Tube rectifier
Direct coupled

Readily-available (Hammond) iron
Relatively reliable (BB-proof?)
Uncomplicated - no special tricks
No solid-state components
Monoblocks

I am going to list the specs parts I already have here for use here:

PT 370-340-0-340-370 Includes windings for a 2.5V/3.5V, and two 5V/6.3V windings. In hindsight it would have been better to have separate filament transformers.

OPT is 2.5K/3.5K with 4/6/8 ohm secondaries.

Chokes are two x 7.5H @ 160ma or one x 30H @80ma.

I have two of everything for monoblocks.

Mr. Joppa kindly offered this help as a Public Domain type of project so I wont be offended if anyone wants to jump in with questions of their own.

My chassis are close to being finished. I have to decide if I need to put just one or two switches on it. The second switch could potentially be a provisional switch for a delayed start was my thinking.

I have the 2A3's, but no octal input tubes. I have an assortment of electrolytic and resistors, but may have to get more depending on what is needed. I'm good in the wire department.

I had done some preliminary tinkering with PSUD and can get a solid 130 micro-volts ripple @ 419V with a CLCLC and a 5V4.
I also had a CLC that I recall being decent, but I must have mislabeled it when saving.

I might also try to build this in spice as a parallel project, but I won't let it distract me from the physical build.