Re: [Drakelist] Repacement for R12 fuse resistor on L-4B and L-7 power supply?
OK, a local ham kindly gave me a spare glitch resistor as a replacement for R12, and the Drake has been repaired, tested, and then packed for the trip. The homebrew 5m amp has been reconnected to its internal HV p/s, tested, and then packed. I may never find out what caused R12 to blow, because I'm disinclined to mess with the power supply switch again. Sure would be nice to get higher voltage on the 6m amp, because I'm sure the 3-500Z would give me double the current 350w output with a better p/s, but c'est la vie. Thanks to all who responded, both on the forum and offline. 73, Bill --- On Mon, 5/31/10, Bill Dzurilla billdz@yahoo.com wrote: From: Bill Dzurilla billdz@yahoo.com Subject: Repacement for R12 fuse resistor on L-4B and L-7 power supply? To: drakelist@zerobeat.net Date: Monday, May 31, 2010, 3:04 PM Well, I have determined that the cause of my power supply problem is R12, the .82 ohm 2 watt resistor on the B+ output of the power supply. It is visibly damaged. I have searched this list and elsewhere and it seems there is a split of opinion on whether to replace R12 with a similar resistor. Rich Measures and others have suggested using instead a 10 ohm 10 watt wirewound resistor. I am leaving for Europe on Wednesday and need to find a replacement quickly. Radio Shack has a 10 ohm 10 watt wirewound that I can get locally if that will work. Don't think I have time for any mail order. What do you think, will the Radio Shack one work? 73, Bill NZ5N ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drake C Line for sale --
Hi to the group -- I have a very nice Drake C line that I need to sell, as it has become excess to my needs. It does have one minor issue and that is that the R4C cabinet is not original. It was lost somewhere in transition and I have not been able to find it. So, I modified a TR4C cabinet to put on it. Needs paint but it is functional. And to be truthful, one can't really tell much once the radio is in place. LOL! Anyway, here is what I have -- T4Xc, full output and in good shape. AC4 R4C, Has the Noise Blanker installed, with additional crystals - 18.0, 21.10, 39.1, 12.60, 21.10 MS-4 W4 All for $700.00 + Shipping, by way of FEDEX Thanks -- Rick NU7Z ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR-4C issues
just FYI, I took the TR-4C back to my work bench and looked it over again out of the case. Saw nothing, then I tried it on my spare AC4 (both AC4s have been rebuilt btw) and found no issues, took it back to the shack and tried it again and now all is functioning again. Have no idea. Still interested in a source for a replacement RFC13. Loren - WA3WZR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] TR-4C frequency instability
What factors could contribute to frequency instability EXTERNAL to the PTO? My TR-4C has just developed a jittery frequency, jumping back and forth around center freq by as much as 50Hz. I know someone (if not many) will refer me to the excellent articles on PTO rebuilds, but before someone does, let me say that I have rebuilt my internal PTO last year and it has been working flawlessly since then. I believe this is external to the PTO because I am seeing the same instability on both the internal PTO (rebuilt last year as stated previously) and also on the RV-4C PTO (factory original, but has always been stable, other than a heat induced drift issue mentioned in another thread). Is this a Oscillator tube going bad, or some other component in the freq. chain? Thanks, Loren - WA3WZR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
