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Old 10th April 2005, 09:10 AM   #1
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Default project suggestion with spare trans

I have extra set of power trans and SE output trans from my darling project.
The output trans is rated 5watts and the pt output is 200v. The trans are custom-made, wax-potted and has very good freq response up to 50k.
I am considering a 2A3 project with these, or maybe exotic tubes. Any suggestions?


p/s- Initially I wanted to build a 300B with these, but I am guessing the rated power is not enough to be used.
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Old 10th April 2005, 09:19 AM   #2
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Something more exotic of course

What about SE trioded 829B?
http://www.pmillett.com/829b_amplifier.htm
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Old 12th April 2005, 06:17 AM   #3
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I think I will stick with the fashion... penthode driving 2a3 triode.
Not brave enough for exotics.
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Old 12th April 2005, 05:01 PM   #4
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6W6 or two.

12BY7 if you have a bunch (4 or so).

12B4.

I'd say 6V6 but it likes 250-350V.

'Bout 5 6SN7's

6BM8? Kinda low powered though.

New sweep tubes: GV5, GY5, JF6, ... would look neato; needs 12 pin socket though.

Tim
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Old 13th April 2005, 02:18 AM   #5
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how about c45? good rapport i get..

12b4, 5687 too low gain, unfortunately.
I already have 6Bm8 amp..
6sn7.. good potential.
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Old 13th April 2005, 08:26 AM   #6
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Quote:
Originally posted by skyraider
12b4, 5687 too low gain, unfortunately.
Too low gain? One usually isn't too worried about the gain of the output stage as long as the drive requirements aren't too severe...

The of the 5687 (14, I think) certainly is high enough. Even the 12B4 (=6) is good enough.
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Old 14th April 2005, 10:06 AM   #7
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There are some nice low power triodes which are quite cheap. You don't state the Primary impedence of the OPT so you could chose between:
12B4 Ra 1
6CK4 Ra 1.2
6AH4 Ra 1.8
6S4A Ra 3.7

As you go up the Ra you may need to use pairs - certainly the case with 6S4A. As stated, multiple 6SN7 or 6J5GT are also ideas - I've heard those in outputs and they are very sweet and clear. 6J5GT are very cheap, and you can use 7N7 instead of 6SN7. 2C22/7193 would be fantastic, and they're not expensive. Of all the above, that would probably give you the best sound, but you'd need a few and some top caps.
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