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I resurrected this thread because I've got a couple of nice TR-3s? with not so good soup can xtal filters.? I also have a wrecked TR-4, mid to early production, with the single filter box.? I think

Is there an approved or recommended procedure or do I have to wing it. Thanks George K4MLB

Thanks Tom. I like that number! Ed [email protected]> wrote:

If it’s in 100% condition I would ask $1200 Tom W9TAB

Steve, Unfortunately (or fortunately in my opinion) my stove and dryer are gas appliances so no 240 outlets here. I really dont want to mess with wiring or rewiring it so I will take it to someone for

IF the grid? shunt has opened up, ( or anything else in the path) there is no path for DC grid current.? ?The amp can not be driven....and the power output will be zero.? Input swr between? xcvr

That price is valid for an L-4B that is cosmetically decent and which works well. It doesn’t have to be a museum piece but it must work well with at least 1100-1200W out with the switch set to

Thanks. Yes I do have the manual, but I think I will opt for taking it to someone else with amp experience and 240 to check it out. Ed [email protected]> wrote:

I have one that I bought about 6 or 8 years ago .? I paid $ 1000 for it and it works fine.? Saw a few at hamfests over the last few years and they seem to go for around the same price.? That was?

Thanks. Ed wrote:

The info is in the slides/video from the 2014 Drake Forum at Hamvention. ?Link is found on the WB4HFN website.

Ed, In one of the videos/slides from a Drake Forum presentation at Hamvention, there is a "shopping list" of things to check on an L4B, newly acquired. ?The info is on the WB4HFN website. 73, Evan,

I see. I have been licensed since 1988, active for most of that time and have never owned or operated an HF amplifier. Hopefully I can find someone to help me determine exactly what I have. Ed KG5UN

Ed, That is a fine amplifier. ?Pricing depends on cosmetic condition, output power from the tubes, condition of the power supply, and the condition of all the internal components. ?Some mods add to

I just picked up a Drake L-4B amplifier. Looks great, but I have no idea if it works. I dont have 220 volts in the shack to hook it up. I doubt I will keep it so I was wondering if I were to sell it

Craig Thank you for the response. * Do you have plate voltage present? As others have mentioned, be careful with this. Do you have an HV probe to use with a meter? Can you actually verify that the

The Internet (not 'google' - because precision in communication matters), essentially (in this context) translates "uncanny valley" as the robotic sound of DMR. FreeDV also contains 'robotic' voice

Hi Jake- I haven't troubleshot amps other than basic mechanics of tightening loose bits on them. But if I were in your shoes I would get really methodical and start from the ground-up. When I do any

A friend of mine recently gave me a pair of DMR HTs. I am not excited in any way by what I call 2 Meter CB (or in this case 70 cm CB) but he thought I should have them for ARES. For me the audio falls