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Interesting. I suppose I should do the maths now. 500ma for all 3 tubes/3=167 mA .167^2= .027 * 15 ohms - 0.42W. Yeah, that's within the power rating but obviously they decided to increase the

Can you read the top of the label on the crystal filter . Interested in who made it, since I grew up in Cincinnati . de WA8SDF wrote:

That's how they look in my 26xxx TR-4. Barry - N4BUQ

These 1/2W resistors look original. I have yet to measure them but they don’t look cooked. There are a couple of other places where the repair soldering isn’t stellar but this rig right now is

I had the great pleasure of meeting 3A2LF in Monaco some years ago. And I had one of the TR7/R transceiver and L7E/R amplifier from Radio Monaco in my collection until recently. Another thing: I AM

For those of you interested in one of Drake's major forays into maritime service/supply, you can read more about the Radio Monaco Coastal stations at both of these

Hi Stan, In researching the ElectroVoice 638, I found the models 641 & 634 all have the same characteristics, differences seem to be in the physical build or stand. Have you used any of the other

Evan, Sent you an email about the mics you have. Robert

One thing to keep in mind, regardless of the measuring equipment used, is that most (but not all) of the resistors in these radios are 10% tolerance. That means that, at a minimum, your readings can

I have a few and will never use them. I’ll let you know what I have. 73, Clint, VE3CMQ ve3cmq@... Sent: Tuesday, 15 April 2025 21:13 To: [email protected] Subject: Re: [DRAKE-RADIO]

Also, while the type of voltmeter used can radically affect voltage readings, due to the loading effects of low resistance meters, differing ohmmeters should read relatively closely, whether they are

Steve, Does it matter what the frequency of the surplus crystal is? 73, Evan, K9SQG

I am reminded that my stock of FT-243 and HC-6/U crystals on oddball frequencies is dwindling again. Here at AF4K Crystals, I use them for rebuilding onto useful frequencies. Does anyone have a

Looks like you have already gotten a few suggestions. I have a Shure 444 mic I use with my TR5 and TR7. It's a good mic. I also have an Electro-Voice 638, high impedance mic, which I use with both

It is an impedance matching buffer to allow use with medium and lower "impedance" inputs. The D-104 cartridge is easy to tame. Just disconnect the internal circuit from the audio line and solder a

I wasn’t trying to track down a specific problem. I just wanted to perform some cursory checks to see if anything was off-kilter that I might not be aware of and this particular reading puzzled me.

I have to agree with Gary. ?Typically Drake didn't update the schematics as minor changes were made throughout a given production cycle. ?That would have been a nightmare to try to have the

Drake manuals were not free of mistakes, especially in the voltage/resistance charts. What problem are you having with this radio? Gary W0DVN

Hi Guys Here arts my comments on a mic for the TR7: - The manual mentions 2 mic namely the Desk mic 7077 and hand mic 7073, - I use a Heil HC4 or HC5 elements with Heils audio transformer and they