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Re: Hw-101 signal traces

Mike McCarty — Mon, 23 Nov 2009 18:37:45 GMT

... Micas and ceramics are normally quite stable over time, and don't need checking. That said, I've found a few ceramics which had become microphonic, and

Re: Hw-101 signal traces

re.carter@... — Mon, 23 Nov 2009 18:26:18 GMT

Yes, R112, not 212. Thanks for the tip an C113. Testing the resistors is easy with a VOM, but I don't have any easy way to test caps. Maybe I should invest in

Re: Hw-101 signal traces

Mike McCarty — Mon, 23 Nov 2009 18:12:42 GMT

... I've seen them out of tolerance by orders of magnitude. I recall a very weak receiver I had. I eventually tracked down the grid leak in the LO tube. It was

Re: Hw-101 signal traces

Mike McCarty — Mon, 23 Nov 2009 18:08:24 GMT

... Your meter magnet may be losing its magnetism. Those d'Arsonval meters depend upon the magnet strength being constant. I've found that they gradually

Re: 3.6Mhz crystal

Mike McCarty — Mon, 23 Nov 2009 18:04:54 GMT

... Typical crystals are only accurate to 0.05% anyway. Yours is only 0.02% high. Also, most crystals can be pulled about 0.1% or so. This crystal would likely

Re: Hw-101 signal traces

Mike McCarty — Mon, 23 Nov 2009 17:37:01 GMT

... If you see this only with strong stations, then it's possible that you are simply overdriving the IF amp, and it's going into limiting. ... This indicates

Re: Hw-101 signal traces

HOWIE — Mon, 23 Nov 2009 17:22:55 GMT

I think you meant R 112 on the cathode of V4? I would also replace,if you have one rated at the correct voltage,C113 which goes across R112. Prob has a high

Selenium Rectifier replacement in SB-620

wd4hxg — Mon, 23 Nov 2009 16:54:37 GMT

I have acquired an SB-620. Normal story - "has full screen trace, don't know how to test further". Of course upon arrival there was no trace, and only after

Re: 3.6Mhz crystal

steven — Mon, 23 Nov 2009 15:33:05 GMT

YES

Re: 3.6Mhz crystal

steven — Mon, 23 Nov 2009 14:57:19 GMT

Yes its for a heathkit GC-1000 most acurate clock. Its the crystal on the mainboard. Thanks Steven

Re: Hw-101 signal traces

re.carter@... — Mon, 23 Nov 2009 13:56:55 GMT

It was R212. Its supposed to be 220ohms, but it read about 650ohms. Rich KE1EV ... From: "HOWIE" To: heathkit@yahoogroups.com Sent:

Re: Heathkit HM-10A

Michael Grigoni — Mon, 23 Nov 2009 06:57:45 GMT

... I would very much appreciate having this as a spare to maintain one that I use frequently -- it has been a workhorse for me. I'll email you offlist as

Heathkit HM-10A

Bill Ellis — Mon, 23 Nov 2009 03:12:21 GMT

Hi all, I have an HM-10A Tunnel Dipper I built 20+ years ago. It didn't operate when I assembled it, and it doesn't now. The pad that was in the cover

Re: 3.6Mhz crystal

jgarko@... — Mon, 23 Nov 2009 00:53:19 GMT

What's the application? Is it a Heath unit? John In a message dated 11/22/2009 6:57:37 P.M. Eastern Standard Time, steven.ross@... writes:

Re: 3.6Mhz crystal

steven — Sun, 22 Nov 2009 23:57:13 GMT

Unfortunately the clock requires at 3.60000mhz but thank you very much Steven