[Drakelist] Filter R-4C

Looking for a Fox Tango YF-56H2.IF 2.1 SSB Filter , FL-2400, or similar for Drake R-4C Tnx Martin, OZCXX m...@forum.dk ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist

[Drakelist] tr-4c s-meter abnormality and reduced sensitivity

My TR-4C's s-meter points to S-9 under no signal condition. Adjusting the sensitivity and the zero pot won't correct it. I also noticed its reduced sensitivity compared to other Drakes that I have. The s-meter moves as expected when RF gain is lowered. Checked/replaced all tubes. I also checked

Re: [Drakelist] tr-4c s-meter abnormality and reduced sensitivity

Kihwal - Check Pin 2 of V17 for resistance to ground (270 Ohms) and voltage ~7.5 VDC. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Kihwal Lee wrote: My TR-4C's s-meter points to S-9 under no signal condition.

Re: [Drakelist] tr-4c s-meter abnormality and reduced sensitivity

It's 290 ohm and the following are the voltage levels. pin1 0.2v pin2 12v pin5 237v pin6 246v Probably I should check the R's around the meter as the pin6 voltage seems a bit high. Any other suggestion? Thanks Kihwal K9SUL On Apr 14, 2011, at 2:29 PM, Garey Barrell k4...@mindspring.com

Re: [Drakelist] tr-4c s-meter abnormality and reduced sensitivity

Kihwal - OK. Most likely problem is a leaky C212. That Cathode (pin 1) voltage is way too high. the stage is drawing ~42 mA rather than the 28 mA it should be. Check R185, and disconnect C212. The Cathode voltage should drop to around 7.5 VDC. R92 is about 7% high, so in tolerance, but

[Drakelist] Case screws for L4B PS?

What size screws are used in the case for a L4B PS? Just got a nice amp...but the screws were missing on the case for the Power Supply? Thanks... Rich N7TR ex KI3V, N3AMK, WB3JOV www.n7tr.com http://www.n7tr.com Telnet: dxc.n7tr.com N7TR DXCluster