[Drakelist] T4XB TR Relay Replacement and Other Stories about Tech Specials

Recently I purchased an R4B and T4XB from an estate sale as did several others who subscribe to this list. Both the R4B and more significantly the T4XB required a lot of work before they were air worthy. My two radios were from a lot of 9 that were customized and used extensively on CW. Some of

Re: [Drakelist] T4XB TR Relay Replacement and Other Stories about Tech Specials

Hi Pete, I'm sorta glad I didn't get one of those, tho' I almost did. Thanks for the detailed writeup, particularly on the relay job, as that's more directly applicable to future work by others. One problem with your webpage, the only pic that comes up when clicked upon is the last

[Drakelist] Drake R-4c Receiver for sale

I thought I would let the group in on this sale before I place the receiver on ebay. I am looking for a good home for the Receiver. I may be selling the T-4xc, power supply and speaker. Let me know if you want a package deal. For more information:

Re: [Drakelist] Drake R-4c Receiver for sale

Great looking unit Chris, and surely that's a fine price, especially with the Sherwood mods and ALL those extra band/xtals! I'm not buying anything these days with retirement coming at the end of this year, but otherwise I'd be talking to you! Ed Tanton   website: http://www.n4xy.com   All

Re: [Drakelist] Drake R-4c Receiver for sale

Sold 73, Chris On 11/21/2011 08:02 PM, Christopher Kovacs wrote: I thought I would let the group in on this sale before I place the receiver on ebay. I am looking for a good home for the Receiver. I may be selling the T-4xc, power supply and speaker. Let me know if you want a package

[Drakelist] T4XB TR Relay Replacement and Tech Specials Part II

Earlier today I posted information on a webpage I created that documents replacing the T4XB OEM wired in TR Relay with the plug in kind as used on the later models. Al W8UT suggested I have links to the individual photos so that more detail could be observed. Ed Tanton was kind enough to make

[Drakelist] TR7 PIN diodes source

It's looking like I may have TR switch problems (diode has the same resistance either direction. This is the high power PIN diode in the TR switch. Does anyone know of a current source for the UM 9400 (or MA4P1200) PIN diodes in the TR Switch? Are there any substitutes for these diodes?

[Drakelist] PTO clicking

What is the clicking sound I hear when the R4A PTO is tuned past the 0 and 500 Khz? Is this a mechanical warning not to tune so close to the edge of travel? ___ Drakelist mailing list Drakelist@zerobeat.net