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Hmmm. Interesting idea ! Please allow me to share two thoughts. If you sense voltage across the key rather than at the “Probe” port, you’ll preclude any even small delay in reducing receiver

Hi, Mike, I share your thoughts. I was thinking of rectifying the voltage from the "Probe" port on the TR Switch to turn on a transistor, which would apply a control voltage across a small relay.

Thanks for the reply, Mike. Both sections of C12 were horrible. I had restuffed the can with new caps which explains the OPEN and supports your theory. Jeff W8KZW

Hello Jeff! From the diagram on the back page of my T-R switch instructions (Figure 2) it appears that Johnson is estimating the DC leakage in C12A and C12B, the power supply filter capacitors. That

It is one of those "I should know this but ..." questions. For the Johnson 250-39 TR switch, Table I presents the resistance at pins 2 and 5 of the 6BL7 as 100K ohms. For the life of me, looking at

Watch You Tube vidios on the Viking II.? Only slight difference is the final loading. Lee, w0vt

I have a Viking I transmitter. Anyone know of any videos that sow how to bring it on line a transmit. It is not as straight forward as today's amateur gear and I am having trouble finding anyone who

Great – I’ll try ‘em ! Thanks !! Mike/ K5MGR ____________________________ Mike Langner 929 Alameda Road NW Albuquerque, NM 87114-1901 (505) 898-3212 home/home office (505) 238-8810 cell

Mike/K5MGR: There are two tektronix user groups where you could offer to sell (or give away) the Tek manuals: Tekscopes, and Tekscopes2.? There's also a Tektronix museum in Oregon that might accept

Hello everyone ! I have recently acquired in a box of mostly Tektronix manuals (for which I'm also looking for a home) a Johnson Viking I transmitter manual. It even has the un-numbered page with

Hi Mike.? I also use a T/R switch with my Johnson Ranger and RME 6900 receiver.? I use my Winkeyer USB to solve the muting problem on CW.? It has a facility to activate a PTT output, designed to

Hello Group,? For sale are a Johnson Thunderbolt and a Johnson Pacemaker.? Both are in excellent, uncorroded or rusted, condition.? Collector quality, except for scratches on the top outer

Mike: This sounds like a great project.? If you haven't already done so, you might want to locate a copy of the Heathkit HW-16 manual and schematic; this was a full QSK vacuum tube

Hi Folks, I don't expect any of you to waste a lot of brain cells on this idea, but I thought I'd run it by you to see if you experts might have an idea for me to try: I'm rebuilding a Johnson

I myself do not like the d104 that much to much high end for me. I have replaced the elements with electret and some good foam and it makes for a nicer sounding microphone in my opinon. Also you might

I have a Valiant I that I'm rebuilding from the ground up.? In the original schematic, Johnson used a double fused plug with two 8A fuses. ? I assume that was because the plug was non-polarized and

Please contact me off-list and I can do that for you, then I can report here about the file or files. I'll make one folder called Ashley Hall and I can put multiple files in there. Just name the

Floyd Hello??? OUR POV is the really high 6146 EP does not get you anything much in terms of RF output, but it does, from our POV, generate a whole pile of HV related issues and problems. ( AKA

I was concerned about the resulting voltage if the 5R4 is replaced with diodes.? Our line voltage here can be up to 124 VAC and I understand the design line voltage for the Ranger was 115 VAC.?

Floyd Hello??? TY for the kind wordsWe retain the 5R4 for two reasons: 1), The additional RF power output achieved with the increase in HV is negligible, and the HV increase puts a strain on HV