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Well I was correct about the bias being fiddled with. The predriver had a constant 8ma, TX/RX (should be 100ma, TX). The driver had 900+ma, TX (should be 50ma, TX). The finals, RX is 10ma and TX was over 2A TX. (should be RX+20ma for 30ma). I know I'll eventualy replace the other 3 520s, just...

Iv'e been trying to patch up a new to me 955. The 1st things I noticed were the Frequencies being out 1khz in all modes and bands, it displayed correctly but would need clairified to transmit properly. I was able to figure out and use the "BFO" and 'VFO" settings to fix that. Then noticed the...

I understand the rules and wish to enter into the drawing.

I meant replace R130 with the Diode/Pot combo on the silkscreen, in my above post. We leave R131 alone for a good working limiter.

I did this to one of my old Grants. It works great! I had to adjust the 1uf up a bit and added a pot and diode where R131 would be, I just followed the silk screen and ended up with a great working limiter. I noticed .that more uf = more sensitivity for swing.

A few things I've picked up were to beef up a few of the caps for the regulator and audio chip. For C172 I'll use a 2200 or 3300uf and C181 gets a 1000uf. These help keep the whole radios voltage steady. If you leave C232 empty it will eliminate the muting between channels while the channel...

I helped a friend repair the same issue on his Craftsman a while back. You're totaly right, the original stuff is way too cheezy for what it has to do. My old 1990s Ford LS25 still works, but has major slop and is getting hard on my poor elbows especialy with all of the bushings that make it...

I tried to add more above, 20 is the limit

I'll dig up some pictures. I need more pics :unsure:

Me too, I hate when they float above the board. Larger ones might even get a drop of adhesive. Gorilla glues Cear Grip Contact Adhesive, It remains removable. I've heard once that some might need the space between the board, *Inductance*? interference*? Anyone know?

Heck yeah, These are great if you're focusing on one radio at a time and bringing back original performance and quality. But, if you want to experiment with different enhancements or characteristics in the radio or just have multiple radios to go through, bulk is a better option. Just so you...

Thats what I do. I just order 10 to 50 or so of each at a time from Mouser as needed. Some get used more than others. It helps keep my storage bin space to a minimum. Keep in mind that some are rated for 50v. Also 0.47uf is as small as I have ever ordered, I havnt seen much difference using...

Is it more on LSB than in the other modes? The LB209 adjustable coils drift like a bum in the sun, and some are worse than others. I'm wondering if recentering their adjustment height because of our disabling VR6 and using the 470 ohm in ground has anything to do with it. The only other...

The .47uf in that spot does cause a small delay that can be seen on the scope. I used a 1M resistor from the ( - ) of C96 to ground to chill the DC that ends up there. But 1st a 10K from the same spot to pin 4 for the slightly flatter response I was looking for. We now have impressive...

I guess it was too big, I had no idea that could happen. It must have been like that for a while, I don't know why I didn't notice before... I tried a 2.2uf and a 1uf (which I thought was there), they both caused simular delays.

I wasn't going to have time until tomorrow morning, but plans change. I was exited to try Brandons suggestion of pre heating some of the 1156s nearby components. Before I grabbed the soldering iron, I wanted to look if any DC voltages on any of the pins changed during the "pump up", which could...

I did this on a hunch with a simular radio. Find test point 2 and measure voltage to board ground/ not chassis ground, on channels 1 and 40. Remember the number on 40, while keying slowly turn L13 to its max top and bottom while watching your watt meter for movement. record max and min...

I have fun posting these, I always hope someone can learn along with me, and maybe geta kick out of seeing these old radios come back to life. Here's another Sears Roadtalker, it's a 663.38070700 AM Radio. I had recently pulled a few radios off the shelf to make sure they work to put on...

Is the VCO voltage in check? It might just be out of lock. I think a failing channel switch can do this also by creating incorrect pin combinations. I feel we should hear a small POP when the power switch is cycled, so be prepaired for multiple issues. (or do they fully mute, out of lock?) I...

Theres a Neon Bulb with a 150pf in parallel before the SWR bridge. Does anyone know what thats about? .... A safety device maybe?....