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 Post subject: Collins 75A-3 RF gain function?
PostPosted: Oct Tue 05, 2021 1:39 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 452
Location: Green Valley, AZ, USA
{EDITED for clarity)....Just got one and ordered a manual but pending on arrival next week I have a question while I wait.
Seller told me the BFO didn't work but it does with audio in CW very, very weak with RF gain at 10 and at 8 no audio but AM audio works and is loud but is gone at RF gain set at 8, so I suspect it has an AVC problem. The 6AL5, 6BA6, & 12AX7 are all good, checked by substitution with known good tubes.
RF gain control works in CW and AM mode and I think its supposed to work in CW only.
Can someone with a properly working unit confirm the RF gain works only in CW and not AM?
Thanks
Hank


Last edited by wd5jfr on Oct Wed 06, 2021 12:39 am, edited 1 time in total.

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 Post subject: Re: Collins 75A-3 RF gain function?
PostPosted: Oct Tue 05, 2021 11:10 am 
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Joined: Oct Thu 01, 2020 10:48 am
Posts: 98
RF gain works in all modes, AM, CW and FM if you have the optional FM module.

BFO: Try a different BFO tube.


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