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Sounds good. Keep me informed. Thanks! ~Cheers~

Groundwire, if you part with that amp please let me know. I will buy it as is! ~Cheers~

Is it the PLL version or the 40 channel crystal version? Can't remember if there are any major differences, other than the PLL circuit, but R363 controls the AM "S" meter, R364 controls the SSB "S" meter. R520 adjusts the squelch. That's on my 40 channel crystal version of the 1000B. ~Cheers~

Is it me, or are the mica caps on the input transformers too high in value? I was thinking they need to be 330pf, not 500pf. The 468 trimmer is suitable for its application, unless it got damaged and it's open. Usually, it's best to use the trimmer cap to dial in the input match, then measure...

Removing R131 disables TR26, which is the AM mod limiter transistor. Changing the value of R131 will allow the AMC to function, but across a wider range. ~Cheers~

Change out R131 to a 15k ohm. On the original 148's, R131 was originally a 10k ohm, increasing the value would bring up your modulation on AM. Am I correct in assuming you have low AM modulation? ~Cheers~

Since the final is bolted directly to the chassis, the caps are needed for impedance matching. When you isolate the final from the chassis, you no longer need to use the caps to match the impedance, since the impedance mismatch is removed by isolating the final off the chassis. And you're...

It's a poor design. What is going on is that the final is directly grounded to the chassis and is not isolated by a ceramic or mica insulator. Because the mounting tab on the MRF477 is tied to the Emitter leg internally, bolting the transistor to the chassis effectively ties the PCB ground and...

Betty, MaryAnn, and Betty White. And it's not even a contest. ~Cheers~ P.S. --------> Gnorph

Sounds like it was a good thing I didn't buy any of the ASI 2879's. I'll stick with HG's or Toshibas. ~Cheers~

Robalo, When you're doing your peak and tune, what are you adjusting? Just L30 and L32? Or are you adjusting other things? ~Cheers~

Technically, bias current should be set based on the beta (gain) of the transistor, and not by a set number. Now obviously, in a mass production setting, this was impossible to do... but as a rule, that's the proper method. But if replacing the driver, final, or both, that's the way it should be...

Dmans, Oops. I got confused on TR401, that's the pass regulator transistor for the power supply, yes? If so, leave that one where it's at, it's not hurting anything there. If you are concerned with cooling, you can replace it with a TIP35C and it will run a little cooler, just make sure to use...

Dmans, Remote mounting TR401 to another spot is a good idea. I usually mount it on the heatsink fin that the audio IC is mounted to. That will work fine. ~Cheers~

Yeah, the radio isn't going to swing more because of more bias current, only thing increasing bias current does it change the class in which the final operates, up to a certain amount of current. Each final will bias differently, and will have their own "soft cap" on bias current, depending on...

Oops, I didn't see that initially. I'll delete my original post. Thank you for the heads up! Sorry! ~Cheers~

Just recently.... recapped and aligned an old Midland 13-893 AM/SSB 23 channel mobile. It was an Ebay special I had bought about 10 years ago, it had a switch on the side for extra channels. That radio has probably the smoothest audio of any radio I've ever owned. I'll never get rid of it...

Let me know how they do, I'm very curious! ~Cheers~

There's a guy on Ebay that's selling them as singles. I thought about buying a set of 8 to keep around in case I was able to snag a Sweet 16 carcass. ~Cheers~

TinCan, That's crazy how a carcass can go for near 400 bucks... but it IS Evilbay.... That other amp just looks... cobbled, ain't no way he's getting 3k out of it as he claims. However, it could go reasonable since he has zero feedback, so I may watch it. ~Cheers~