This is the circuit diagram of a EF86 preamplifier.
https://imageshack.com/i/mv8j8lg
https://imageshack.com/i/2h7pog
https://imageshack.com/i/1a2xf8g
https://imageshack.com/i/5mdk3ng
Then I found a circuit that is claimed to be the same circuit, but how come 5 tubes (below) vs. 6 tubes (above -- stock / original)?
https://imageshack.com/i/3uzdfg
Are they really the same?
Thank you!