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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 20th Aug 2017, 1:52 pm   #21
PJL
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Default Re: Antoria Record Player and amplifier

1M anode load for an EF86 is really extracting the last bit of gain out of it, ra is 2.5M so I guess there is still benefit.
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Old 20th Aug 2017, 1:53 pm   #22
Edward Huggins
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Default Re: Antoria Record Player and amplifier

Yes, but this will make a superb practice amplifier with a little bit of 2nd harmonic atmax volume!
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Old 21st Aug 2017, 1:13 pm   #23
crackle
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Default Re: Antoria Record Player and amplifier

I have traced out the preamp circuit. The gram/mic switch had some loose contacts making it a little intermittent, so I made a modification to the circuit around here and replaced the switch with a 1M potentiometer. This has now enabled the original volume control to be used as a "master" volume.

Here is the circuit.
There is a striking resemblance with the preamp circuit to that used in the VOX AC4. I suppose it is all standard stuff..

Mike
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