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.
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.
Something more exotic of course
What about SE trioded 829B?
http://www.pmillett.com/829b_amplifier.htm
What about SE trioded 829B?
http://www.pmillett.com/829b_amplifier.htm
skyraider said: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 µ of the 5687 (14, I think) certainly is high enough. Even the 12B4 (µ=6) is good enough.
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.
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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