Re: [Drakelist] PTO capacitors.....

Ski - Yes, those are the 'Dur-Mica' style caps made by 'Electro-Motive', and used by Drake. That some are failing almost 50 years later isn't all that surprising. I haven't run into these failures until just the last couple of years, so perhaps they're all ready to fail! :-) CDE also makes

[Drakelist] PTO capacitors.....

After working in communications for the State Police here in Michigan for 37 years, most of our equipment was from Motorola, and we have had several problems with silver mica capacitors made by a company that marked there components with 'EM'. If you find a circuit that is in suspect of causin

[Drakelist] R-4A PTO - Looks like I have the smoking gun!

Fellow Drakesters - I'm listening to my R-4A chassis sitting on the desk, monitoring 20 CW and everything sounds a bit drifty but otherwise great! After carefully replacing that large brown capacitor I removed yesterday - which Garey and I determined to be the same as the large glass capacitor

[Drakelist] Drake 4 Series PTOs

It's now official.. The Drake PTOs seem to be 'all over the map' as far as what you might find inside the can. I have worked on perhaps a half-dozen in 'recent' times, and ALL were different. Some were 'close' to the schematic for what they were found in, but more were not. Now we kno

[Drakelist] Knobs

Hi to all:Who was the manufacture and supplier of the Drake antenna tuner knobs and amplifier knobs?73,Chuck___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

Re: [Drakelist] TR7 problem

Clean those PC board contacts. - Original Message - From: dpetersen tds.net To: drakelist@zerobeat.net Sent: Thursday, August 11, 2011 12:03 AM Subject: [Drakelist] TR7 problem Hello Group: I am the recent recipient of a Drake TR7 with the PS7 power supply. It has evide

[Drakelist] L4-B Vernier Red Pointer for Plate Control

Hi to all:Is there a supplier for the red pointer and vernier control that goes to the Plate control of the Drake L-4B?Thank you.Chuck___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

Re: [Drakelist] Okay, so what IS the big brown thing?

Hey, Garey - I guess we got tripped-up over terminology. Yeah, the "kidney bean" is the only 3000 pf cap on the PTO board. Looks like I'll put that tubular one back in tonight. I have only a ceramic 3000 pf right now but at least that will give me proof-of-concept. When working on old stuff

Re: [Drakelist] TR7 problem

Dan - Your symptom is due to the phase-locked loops failing to lock. First step is to at least unplug and re-plug each card and connector, preferably applying liquid DeoxIT to all contacts as you go. If this does NOT clear up all your problems, check the DC voltages, especially the -24 VDC, a

[Drakelist] RV-4 cable

I purchased an RV-4 and found it would not tune the TR-4 it was attached to. After investigation and confirming sufficient output and frequency, I found the coax in the cable had developed an open about midway. Anyone know the spec. on the signal lead coax? I'm pretty sure my only shot is to dis