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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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18th Aug 2021, 1:32 pm | #21 | |
Triode
Join Date: Jan 2019
Location: ASHEN ESSEX
Posts: 33
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Re: AR88 BFO problem.
Quote:
After seeing your post I did the same …When the BFO stopped working after about 20mins …turned mains off and then back on again …BFO restored …in fact BFO hasn’t failed since switching it back on this morning ….maybe it will be the same tommorow? …definitely a strange one . Thanks for all suggestions…sorry no scope here …haven’t had chance to open the 88 up yet to try and see what if anything has already been modified ….it does have the 2nd headphone socket , adjacent to the original one ….think that may have been done during a MOD overhaul.
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G4HTZ ASHEN ESSEX Restored a VIKING 2 AM TX Now playing with a AR88….. |
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18th Aug 2021, 4:17 pm | #22 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,015
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Re: AR88 BFO problem.
I'm thinking what about the heater in the 6J5 or the heater wiring/pins in the base and socket...?
Goes open circuit when hot? |
25th Aug 2021, 11:34 am | #23 |
Pentode
Join Date: Jul 2014
Location: Bangalore, India
Posts: 132
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Re: AR88 BFO problem.
I second G4MDC Jon's suggestion.
Ages ago, I had a similar experience with an AA5 AC/DC radio having series-connected heaters. After a few minutes of operation it would gradually go dead with no glow from the tube heaters. But all the heaters would test okay for continuity after the tubes were cool to the touch. The faulty tube was isolated after a hurried check was carried out, wearing oven mitts! Nandu.
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