[Boatanchors] HRO-60 motorboating after repair

[Bob Young]

Thanks, that socket is not very good on that 6BE6, I have some coming from Antique Electronics, maybe that is the problem. It happened right after I fixed(?) the socket so I'll check there first, I also just got a cap kit for it, it would be quite a coincidence though if the filter cap opened right at this time

Bob
KB1OKL

From: grimm at sbc.edu
Date: Tue, 7 Jan 2014 08:51:26 -0500
Subject: Re: [Boatanchors] HRO-60 motorboating after repair
To: bobyoung53 at hotmail.com
CC: boatanchors at mailman.qth.net

Bob,
The most common cause of motorboating is an open filter cap in the power supply.  Try bridging a good cap across the one in the radio to see if it changes or cures the problem.  Failing that, your best bet is an open grid circuit at any tube in the radio.  Good luck finding the problem.


73,

On Tue, Jan 7, 2014 at 1:01 AM, Bob Young <bobyoung53 at hotmail.com> wrote:


I wasn't getting the 2010 kc 2nd conversion tone with the signal

generator on, double conversion coils were practically dead and found

the 2nd converter 6BE6 tube socket had a bad pin with no contact (pin

7), fixed it and now it is motorboating but it does it even with the

tube out and no coil in so I'm not sure that caused the problem or not.

Could disturbing the wires around the socket have caused this? Will this

 be a problem if I let it motorboat while I look for the problem? So far

 I turned it on only for 10-15 seconds at a time, thanks ahead of time,



Bob Young

KB1OKL

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