Quote:
Originally Posted by thermionic
Excellent work, Andy!
If you have a couple of 6J5’s hanging around, I can heartily recommend my simple low voltage circuit to increase the drive level slightly 😜👍
Cheers. Simon.
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interesting low voltage circuit. Great if you don't have a ready source of HT.
Andy if you use this, just use one of your 6SN7 as they are the same valve in a dual triode package.
Myself I'd use 2 x 6SN7 or maybe a couple of ECC82 with the first valve as a normal common cathode amplifier and the second triode as a cathode follwer and then you can have the power amps away from the main sources as the CF would drive a fair old length of wire if needed.
Or make a mu follower from a couple of 6SN7 which will give you a nice lo Z output but the gain will be around 20x from that valve. which would be a 2 volt drive from a 100mV input, then again some older sources can be that low.
If you had the PSU and mono blocks closeish to the preamp then I'd just pinch a bit of heater and a few milliamps of HT off that.
A.