After some further googling for info on the internet, I've found that you can substitute an ECC88 tube for a 6N1P, I was doing some quick reading of some service manual PDFs for my Telequipment D33R Oscilloscope, and found that it uses a few ECC88 Tubes, since some new 6N1P tubes from Evatco will probably set me back something like Au$20 each or so, I'm going to try using three ECC88 tubes from my Telequipment D33R scope to build the OTL Headphone amp instead of three 6N1P tubes, I've read in a forum that the ECC88 sounds better than the 6N1P.
From looking at the circuit of the 6N1P OTL Headphone amp, one half of V1 is used as a common cathode voltage amplifier, it's anode is connected directly to the grid of one half of V2, which then has it's cathode connected to the anode of the second half of V2, this forms a low-impedance output stage, it's an interesting design, very simple for an OTL Headphone amp.
Update:
Turns out there was only one ECC88 tube in my Telequipment D33R tube oscilloscope, the rest of the tubes in it are either 6BL8, or ECF804 small-signal Triode-Pentode tubes, so I'll have to order some 6N1P and ECC88 tubes from Evatco after all.
Last edited by DrNomis_44; 24-08-2020 at 10:25 AM.
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