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I recently acquired a T-4XC that had been sitting around at least a dozen years. It seemed to work as it should, however, when I develop more than 40 watts out, the fuse in the AC4 blows. I have two AC4's, one with upgraded caps. The result was the same with both power supplies. I went ahead and ordered the Hayseed cap assembly, but wondering where else to look. The AC4's have no problem with my main T-4XC. thanks, Burt W3IO

Hello Drake community, I have a tricky one. There is a reed relay in the TR5, just after the low pass filters, which will short circuit the receiver during TX and connects it during RX. So there are two contacts, one NO and one NC. I think they chose reed relays because of the full bk capability. Now in my TR5, while the short circuit part seems to work, the switching part remains open. RX is heavily attenuated. It seems the relay is damaged. It is labeled wabash 1952-1-1 H1 An internet research didn't reveal much except some wabash relays on ebay with different part numbers. I hadn't heard of that company before. They seem to be Coto these days. www.cototechnology.com Any ideas? TNX and 73 Dieter DL5RDO

I have a couple of Drake items and an excellent to mint condition Gonset G66B receiver with Gonset 120VAC 6/12VDC power supply for sale on my For Sale webpage. Items For Sale If interested in purchasing any of the items listed on the above webpage, contact me off group at my email address mikew5rkl at gmail dot com 73 Mike W5RKL https://www.w5rkl.com

I assume this question has been answered a hundred times, but can't seem to track it down. How are T-4XC users triggering the "Antenna Relay" on the SB-200? I was using a Kenwood TS-590 previously, and the amp has the 'soft switch' mod. thanks, Burt W3IO

Had to step away for a bit to go see my daughter. Finally got back on this project and found a “sketchy” solder joint on C165, a ceramic capacitor on the injection trimmer for 40 meters. Resoldered and touched up a few others while I was there. Back to full output on all bands. Larry

I've been to the K4OAH site but it's slightly unclear how to order. Is it sufficient to send the funds (PayPal, etc.) with a note stating which manual one is ordering? I bought one before Garey's passing but not since so I want to make sure how to do that now. I presume I could send an email to the mindspring address on the K4OAH site as well? Thanks, Barry - N4BUQ

My question is, is there a mod to the SP75 if you are using a Heil Mic on the TR7? I am getting some problems with Audio and TX on my station that I installed an SP75 with a Heil Goldline mic. The amp is an L7 that is very stable with the SP75 out of the circuit. Any comments are most welcome. Bob

On a recent walk, I noticed a new vertical antenna a few blocks from me. It had traps, so most likely a ham. Back home, I was surprised to find city-data.com has FCC license data organized by community. To take a look, enter this in your favorite search engine and append a US city and state. site:city-data.com amateur radio licenses Example: site:city-data.com amateur radio licenses Montpelier, Vermont 73, Tom, AG9X

I've posted recently about some problems I've had neutralizing the finals in my TR-4. I think in the last post I made about it, I stated that the original 12pF (C77) that's across the variable capacitor, C76, tested completely bad ("No, unknown, or damaged part"); however, it occurred to me that this tester (a "T7") isn't spec'd to test below 20pF so the original may still be good. In any case, I ordered some replacements (a 10pF, a 12pF, and a 15pF) and they arrived today. I tried the 12pF and got basically the same results as the original (a semi-null with C76 fully open). I then decided to try a 2pF SM I happened to have and that gave me a semi-null with the plates fully closed so I figured the sweet-spot must be somewhere between those two values. Since I didn't have anything on hand at around 7pF, I connected the 15pF and the 10pF in series to obtain 6pF across C76 and that gives me a null with the plates virtually at the half-way point so now I'm searching for a suitable capacitor in the 6pF range but I'm not finding anything. Anyone know where I might find a suitable capacitor? If I can't find something, I may just stick with the two capacitors in series but I'm not very fond of a "flying splice" like that. What I'm really wondering about is why this rig needs only half of the original value capacitor in that place. I know that Steve has mentioned a brand of tubes that apparently needs a little more capacitance but haven't heard anything about needing less and so I'm wondering what could be causing that. As far as I can tell, there are no other capacitors in parallel with those two but several other capacitors connected to that part of the circuit in one way or the other. Any suggestions as to anything I might look for or maybe I should just chalk it up to the rig being 60 years old and several factors could be at play because of aging parts. Thanks, Barry - N4BUQ

Does anybody know a valid email for Sindre? I've not been able to receive a response for the past several years. 73, Evan, K9SQG _._,_._,_

Yes, Ken, that email works. Thanks to those that provided me with the needed info! 73, Evan, K9SQG On Wednesday, April 9, 2025 at 08:11:12 AM EDT, Ken, WA2LBI via groups.io <wa2lbi@...> wrote: Does this work? sindre8095@... Ken WA2LBI On Wed, Apr 9, 2025 at 8:07 AM Sindre Torp via groups.io <sindre8095@...> wrote: Evan, You got mail !!!! Sindre, LA6OP ons. 9. apr. 2025 kl. 13:20 skrev Evan via groups.io <k9sqg@...>: Does anybody know a valid email for Sindre? I've not been able to receive a response for the past several years. 73, Evan, K9SQG

Hello, friends, I have a TR7 that initially exhibited display issues—random numbers appeared with dim brightness, and none of the bands were operational. After consulting with the forum and following the recommended steps, I inspected and cleaned all the unit’s contacts, but unfortunately, there was no noticeable improvement. Some time later, a friend and I resumed the repair process. After checking various components, we traced the issue to the DR7 board, specifically the U9022 counter (MC14518B). Upon replacing it, the display began to show the correct frequency. However, only three bands are currently working (1.5 – 2.5 and 28.5 MHz). We’ve identified the root of the problem as the PROM memory (U9003) (MMI 6300), which has two inputs shorted. I would greatly appreciate any information regarding this component, particularly the data it contains. Additionally, if this memory is no longer available on the market, does anyone know of a compatible replacement? Thank you in advance for any assistance. Diego Gallo – LU3HDD

I have in process a second lot of replacement blower wheels for the L-4B amplifier. These are the exact same blower wheels made by Torrington for Drake, with one exception. The blower wheels used by Drake have a hub (motor shaft) diameter of 0.25". The ones that I have located have a hub diameter of 0.125". I am having these machined out to 0.25" making sure that concentricity and perpendicularity are maintained to prevent an out-of-balance condition/vibration. My cost has increased slightly from last year. The cost will be $42, shipped US Postal Service. If you are interested in one, please email me at markhh@.... 73, Mark NO8J

The following items have been added to the Files area of the [email protected] group. /TR4310/MMI6331_PROM.jpg By: atlasstuff <g4fph@...> Description: Possible substitutes for PROM in TR4310 (and TR7)

i try to contact No8j for a blower wheel its very hard to contact him. any body nows more thx Pd0fw Fred