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If your plate current t is pinning with the drive turned down, you may be losing your bias connection. Clean the blades of the Jones connector with DeOxIt and a Q tip. 73, Steve Wedge, W1ES/4 Time

I am sorry but I can't remember the exact value. It is important mainly in setting the idle bias. Again you can check the current at the 15 ohm cathode resistors.? They tend to go high

OK, did a little further research. I have not checked it yet but the cathode current meter shunt is 2.7 ohms 1/2W. I see a replacement in a WB4HFN slide show uses three parallel 10 ohm 1/2W resistors.

Two sites to bookmark.K4AOH. Order Garry barrell's ca for the C line. Available from his wife. You can download them.? Not expensive.??WB4HFN. Has tons of stuff.Study the metering circuit.? Note

Now that I have the AC4 rebuilt, I moved on to the T4XC. The transmitter was given to me probably 7 years ago by a now SK ham and has been stored by me since then. Probably not operated in over 10

Jim Shorney writes: You, sir, are a Geeeenius! :-) Also, then it will match the PS-75. --lyndon

Just make it C-75 and you're good either way. 73 -Jim NU0C "Lyndon Nerenberg (VE7TFX/VE6BBM)" <lyndon@...> wrote:

VE7PS writes: Oh shut up! :-) I was in no position to afford it, but it popped up out of the blue and there was no way I was going to let it get away (just like the TR-6). I am really looking forward

Lyndon... Now you need to change the number on the console! Or buy a TR-7...... Either way...congrats on the new rig! 73 Peter VE7PS

[ ... ] I was wrong. --lyndon

Correction: It is the MRF 455 Finals I have Marty KL7AM To: "DRAKE-RADIO" <[email protected]> Sent: Saturday, March 11, 2023 8:29:10 AM Subject: Re: [DRAKE-RADIO] Drake TR5 schematic I have new

I have new matched pairs of driver transistors for the TR-5 Contact me off list if interested Marty KL7AM To: "DRAKE-RADIO" <[email protected]> Sent: Thursday, March 9, 2023 3:21:45 PM Subject:

Nice catch. Those 1/4 Watt carbon comp resistors that Drake used seen prone to that. 73 -Jim NU0C "Dave Cutts via groups.io" <g4faw@...> wrote:

Yep, mine is a later one with split rear panel and green solder screen on the boards.. The component position of the Mic input resistors is slightly different. Anyway, found a cracked resistor (150k)

Yes, there was to the Predriver board. The Transmit Exciter is a completely different board. Both Predriver version are covered in the service manual. 73 -Jim NU0C "Rob Sherwood" <rob@...> wrote:

Well, no. That is the Predriver board, which did have a major change. The Transmit Exciter board is where the mic amp, PTT/VOX, and balanced modulator live. 73 -Jim NU0C "Doug Crompton WA3DSP"

t took about 5–7 days as I remember. I usually always specify the cheapest shipping method unless I am in a hurry. In this case, it was first class mail. I am near Philadelphia. Doug, WA3DSP

I think your answer can be found here - http://www.wb4hfn.com/DRAKE/DrakeArticles/TR7_Comparison_Article/TR7_Idenity-04.htm Doug, WA3DSP

Decades ago on a mobile trip from CO to ME my TR-7 quit transmitting. I was in Ohio so Drake replaced the driver board. I think there was a significant upgrade to the replacement board. Rob, NC0B

I suspect the difference is largely cosmetic. Drake started using boards with solder mask in later years. These will have a green coloring while earlier boards are bare tinned copper. A surf of eBay