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

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Old 23rd Sep 2020, 3:22 pm   #1
Razzmatazz
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Default Rogers RD Junior CH1 smoothing choke

Hi everybody
does anybody know the value of the RD Junior mono amp's choke?
many thanks in advance
Bruno
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Old 23rd Sep 2020, 10:06 pm   #2
barretter
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Default Re: Rogers RD Junior CH1 smoothing choke

If you mean this circuit, it's about 11 Henries. Remember that it only feeds HT to the ECC83 and a single valve in the pre-amp and valves in the tuner so it only needs to be a few tens of milliamps. If you intend to change the circuit and use the choke to feed the EL84s as well it will need a greater current capability.
There is a Japanese clone of the amplifier on the internet which uses a 30 Henry choke at 40 milliamps but that probably wouldn't fit inside the screening can.
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Old 24th Sep 2020, 11:01 am   #3
Herald1360
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Default Re: Rogers RD Junior CH1 smoothing choke

Sounds like the primary of a small class A output transformer would make a suitable choke.......
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Old 25th Sep 2020, 12:18 pm   #4
Razzmatazz
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Default Re: Rogers RD Junior CH1 smoothing choke

thank you all for the replies and pdf!
Bruno

Quote:
Originally Posted by barretter View Post
If you mean this circuit, it's about 11 Henries. Remember that it only feeds HT to the ECC83 and a single valve in the pre-amp and valves in the tuner so it only needs to be a few tens of milliamps. If you intend to change the circuit and use the choke to feed the EL84s as well it will need a greater current capability.
There is a Japanese clone of the amplifier on the internet which uses a 30 Henry choke at 40 milliamps but that probably wouldn't fit inside the screening can.
Yes it is! I do not need to feed the preamp so I think the value you gave me would be ok. thanks
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