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Also, closely check for bad/cold solder joints, they are a common problem in those particular radios. I have so many of those radios come across my bench with odd problems, only to find one or several bad or cold solder joints. ~Cheers~

Now with 20% more Accu-Splat™ modulation mods!! Courtesy of Butt-Fuzz Enterprises, LLC. :D ~Cheers~

More junk. Sad.... (n) ~Cheers~

On both of my 667V's, I bypassed the two fuseholders and installed a single inline fuseholder on the positive lead going to the power supply (since I run them on a base radio). I run 18W PEP SSB into them and I just run it on low with the variable wide open (which is also my recommendation...

Nothing wrong with running a DX1600, if you're planning on just loafing it at 500W or so. Running it there will keep it in the class AB region, as you won't be generating much heat. Buy a fan kit for it, with a good power supply and you're good to go. I ran a DX1200 Hot Plate with a modified...

Sent you a PM! ~Cheers~

That scope reading does not look right at all, the amp is biased class C, but that's a non-issue at this point, I am curious as to what the radio is, what kind of wattage is being driven into the amp, and if there are any modulation modifications present in the radio. That's the kind of info...

Sounds like the transistor is not heating up anymore, so that is good. Next step, if you have weak signal, is to perhaps perform a TX alignment if possible, and see if output power comes up any. I do know that the tube "final amp" stage is prone to problems, so it may be possible that the radio...

If the transistor is not hot with C314 removed, then I would suspect C314 has gotten leaky. Did you replace C314 with another capacitor? Did you check voltages at the base and the collector of Q305 to see if they were the same or somewhat close in value? ~Cheers~

It's based off of the Messenger 250 mobile amp, runs (2) MRF454's. The wattage you're getting is right in line with what it should be doing. The power supply is not regulated, so it'll "float" at a higher voltage when not being keyed down. It's a good amp, but the power supply is a...

Check voltage at the collector leg of Q305, which should be the C1306 (or C2166 if you replaced it), then check the base leg of that same transistor. If the voltages match, or are somewhat close to each other, you're getting too much voltage at the base, which will heat up the transistor. If...

On a Cobra 142GTL, you can turn down the deadkey by adjusting VR6, it's located near the Audio IC, which is along the right side of the board. Adjust it so it's down to about 1.5-2W deadkey, no need for anything higher for that amp. Check to see if you have high SWR. If the problem persists...

I have a HR2600 chipswitched and recapped I'd let go for $225.00 plus shipping. Has the mount bracket, mic, and thumbscrews, with manual in original box. I don't have a power cord for it, but I converted it to the standard 3 pin plug that the mobile CB radios use, so getting a power cord will...

Oops, correction, the "regulator" I talked about is actually an SCR. These are the two problem areas as outlined in the picture. You can get the SCR on Ebay still, and the diode can be either a 5.6V 1W, or a 5.7V 1W zener. Hope this helps. :) ~Cheers~

If the display is completely dark, it's likely the +5V regulator or, the 5.7V 1/2W zener diode. The zener diode in particular is a high failure component, and should be replaced with a 5.6V or 5.7V 1W zener diode. But either part can cause the "blackout" issue you're experiencing. (Edit) I...

That depends on if the loop mixer crystal was changed. If the loop mixer crystal is 11.1125, then pin 10 of the MB8719 PLL needs to be grounded. If it has an 11.325, or 11.3258 crystal in it, then pin 10 needs to be isolated from ground. Since there are no cuts on any traces at the PLL, the...

I'd take it on if I wasn't backed up 6-8 weeks out. The locals here keep me very busy with repairs and mods. :( ~Cheers~

Let me know if you'd sell the amp as it sits. I'll buy it as a carcass. ~Cheers~

About 2W or so. No need to put any more in, as all it will do is make the transistors generate more heat, and heat is wasted power. Put 2W max in and let the radio swing from there, and you'll be good. :) ~Cheers~

Honestly, the best mic I have found that works for the 2510/2600/2830's is a Workman Superstar DM-507. You can buy them on Evilbay for 12-13 bucks. I have tried MANY mics (including the infamous Astatic 575-M6) and the Superstar mic gets my vote. It's a dynamic element mic, and it has nice, full...