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Happy and a Safe New Year to All! Purchased a B line a few years ago and a frequency readout came along with it. It was manufactured by Cobra-Freq Co. Did a search on the Internet and could not locate

Probably would have helped if the correct URL had been posted: https://www.surplussales.com/class/brand/drakmusemeqp.html. Joe - W7RKN From: [email protected] [mailto:[email protected]] On

I believe this is the one you mean. You have to scroll way down and it is on the left hand side. Dan WB4GRA

Dean: The RF Tune has a "0" at the point when the knob is rotated LEFT (counter-clockwise) just at the end of the 160 Band mark. That's not a "0" at the CW end of the dial....it's a "10". It's on the

From what I understand, the same is true (tubes are too tall for the RF cage) with some 6GJ5 tubes if you decide to go that route for a set of emergency spares. - Steve W7SJT "Always look for a

I thought this was in reference to Surplus Sales' (COL) SPKR-4-57 on https://www.surplussales.com/Microphones-Audio/MicroAudio-8.html. Is that incorrect? 73, Barry - N4BUQ

Mark, went to the site, but no speaker comes up with your speaker information. Wrong part number perhaps?? Joe – W7RKN (Ahhhhhh……just did a search for MS4 speakers….sold out!.... MS4, RV4,

Please note that all 6JB6 tubes are not the same. There are several out there that are about 1/2 inch + longer than those supplied with the radios. These will not allow the top of the EF cage to be

I have used GE, Sylvania and RCA tubes with no issues with the 2-tube transmitters. RCA may need additional capacitance to neutralise properly in a TR-4(any) With so many years behind us since these

Jay, I’m looking to do the same thing. A matched pair is recommended. There is also a “A” flavor tube. Which one is correct. Dean Get Outlook for iOS<https://aka.ms/o0ukef>

Peter, Thanks again for the comments. I need to clarify one issue. If you look at the RF Tune control knob. Clockwise there is a small 0. Counter clockwise there i a 0. The instructions to set the

Sylvania 6JB6 are the preferred finals due in part because of easier neutralization.

Group, I'm looking for reliable vendors of tubes for the T4XC. I understand the final tubes have to be from the same manufacturer, but do they have to be a matched pair? (I don't have a tube checker).

Yes. The RFG control isn’t nearly as important on most receivers that were purpose-built for SSB — i.e., with product detectors. I’ll sometimes play with the RFG during contests but rarely

Yeah he "did not mean it" (some good info in there!) If he likes pies, lets not set a fresh one nearby...lol WB0IQK Mark, has the right idea. I too used a dual cone speaker, I wanted to stay away from

This technique was developed originally for receivers that did not have product detectors. Envelope detection is much more sensitive to the ratio of local oscillator level versus signal level, so the

I’ll add my practical experience here. I’ve used Minimus-7 (and its variants) for some time and I find the sound to be quite nice with them. The problem with hiss is more a function of the audio

I learned this as a new novice from my mentor, since "Elmer" was out of style. ?It helps to reduce the effects of lightning and QRM. 73, Evan, ?K9SQG

Richard, The next time you "don't mean" to post something like this, please post it anyway! I found this very interesting. Barry - N4BUQ

I must comment on a couple of things: Hi-Fi speakers have extended range both ways. Hiss comes from extended high end but it may indicate the speaker is resonant or peaky there. Not so good. What you