ECC83S Tube Preamplifier
And test video:
Attention! The circuit operates at high voltages!
H&G Amplifiers shall not be responsible and disclaims all liability for any loss, liability, damage (whether direct or consequential) or expense of any nature whatsoever, which may be suffered as a result of, or which may be attributable, directly or indirectly, that you use of the circuit. During construction and use will be very careful and cautious!