Thanks for that Nick - very informative! So from the circuit as shown, it does basically run on 12V DC HT. Presumably that's what the 1N4007 does - rectifies the incoming AC to supply the DC. I think it will provide more than 12V in this particular instance, in that the AC input is 18V rather than 12V. Yes, I appreciate that just looking at a sine wave on the scope isn't in itself a very sophisticated means of checking for distortion, but at least there was no flat-topping of the peaks with the gain control turned up to maximum. In the final analysis, the ears are the only instruments that really matter!
Incidentally, plenty of valves sloshing around in cyberspace - this seller has 49,847 NOS Chinese make, made in 1984!
http://www.china-hifi-audio.com/en/psvan...-nos-p-605
Incidentally, plenty of valves sloshing around in cyberspace - this seller has 49,847 NOS Chinese make, made in 1984!
http://www.china-hifi-audio.com/en/psvan...-nos-p-605
Regards, David.
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
