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Old 19th Apr 2021, 10:47 am   #31
Valvepower
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Join Date: Aug 2008
Location: Rayleigh near Southend-On-Sea, Essex, UK.
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Default Re: Single ended Class A OP stages.

Hello,

Just checking a pair of single ended EL84 output transformers salvaged from a Trio W-10 stereo amplifier to hand onto fellow forum member for his ongoing 3-3 projects and I’ve measured a primary impedance of 4.3K with a 8 or 16 Ohm load (separate taps) – now after reading this thread I wonder if Trio were using a slightly lower primary impedance of 4.3K, compared to the more common values of 5K, as used in 3-3, to add their take on the bottoming out and loading of the EL84 in a single ended configuration?

Just a thought.

Terry
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