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Mine was wormig and just stop

I am tryig to find the transistors or diodes for recipe as well as ideas

It I would have to check but only signal ingotnis when I keyed my other radio other than that its quiet.

Yes

My galaxy saturn just stop receiving. It work fine yesterday... if i a radio is keyed near by the signal meter goes up but no small signals. So it's not a case of receive audio.tramsmit audio works. Need some help here.

Looking for a icom UI-7 .am /fm board for icom 737

Dear Nomad This has in all.of your boards I bought them a few yr back I would have to check m.y emails. It was loose i wire on the breaker it is up and running I will monitor and keep u posted

Andy have you ever triedthr mosfet mod by 813 of the mb8719 chip radio cobra 148 washington etc

What is the ideal bias voltage on the mosfet

I have a Pride Dx 300 it was change to a 4cx300y tube I been using this amp almost 6 yrs now .Today I turn it on as usual as it would warm up when I cam back and switch to operate it didn't switch on checking I found the overload at the back had tripped I have check the tube.i even...

I got the radio from a local who came back with the radio but he had some blown bulbs so he asked me to check it out.never done a mosfet mod on a cobra 2000 before so I was just asking for knowledge. BTW mosfet is RT1 bias volts 3.85

So far it seems ok I didn't check it in terms of voltage but I m see 13 avg into the dummy load on bird 43. Wha are your thoughts om this particular mosdet.mod

I just spoke to my local he said he replaced tr parts in the bias circuit the one ohm bias diode and trimpot one of the diodes was faulty however I am still seeing about 4 watts max I was thinking since the transistors impedance is different that maybe why I am only seeing 4...

Thanks you Andy..I have 2 cobra 2000 and never saw that mod also I will show u the mosfet mod that was done u can share your thoughts

It is connected to the Base of the transistors

I just got a cobra 2000 I see a mod I have never seen before.can someone tell me what is the mod and also the capacitor value. See picture attach

I understand but he did it the other way in his 2950 he is using (3) 2166 .the driver of course is a 2166 the swr went high and he blew the finals. Since he had no replacement finals he used (2) 2166 in place of the 2312. Since then he was able to order replacement 1969..as said before...

Thank you for the thoughts I was a bit unsure as why a 2166 won't work in a 1969 circuit. I have advise him to replace them with the 969 I think the power should come back. He said the finals had blown and he had replace a few parts so before he wanted to be sure before using the 1969...

Ok I assume my thoughts werere correct his argument was exact the same that with 2 (2166) he was expecting more output but I said I believed it was a difference in circuit.i say actually seeing 3-4 watts was good base on te mismatch. Once he replaces with (2) 1969 he should see the...

Saw a local replaxe (2) 1969 with (2)2116 finals and saw only 3-4 watts out from 40watts with 1969. Ii am thinking since the 2166 rare 5 watts finals his power should be more.