Recent content by bhuskins

Where are yours?

It dialed in great with the final off DBT...thanks for the help...sometime just talking things “out loud” helps locate the issue.

Here’s the repair:

R48 is 4.7 Ω MJE15032G are one the outside in positions. TR11-12 and MJE15033G are on the inside positions TR13-14 2SC984 and the trimmers test fine all (4) original output transistors test perfect Sanken 2SC1116 on the far outside positions and Sanken 2SA747 on the inside positions. I’ve...

Here’s the F-2656

Here’s the F-2624

I went ahead for good measure and replaced the rest of the the transistors on the F-2624 driver board as well as the the (2) 24v zener with 1N5252B...still same results

I also already changed out the two VD1212 with 1n4148 in series as well but had failed to mention that.

I have a DBT but this unit was working so I haven’t been too concerned about running it on it. Both the blue and grey wires feeding the protection board when measured independently for DC voltage with the negative on the chassis read about -53.3vDC

So this 8080db has been fully cleaned, recapped and all the fusible resistors have been replaced. While continuing to troubleshoot the F-2624 driver board I went ahead and put in ksa1220 in TR05-06 and ksc1845 in TR01-04. I have triple checked all of my orientations (capacitors and transistors)...

I’ve got all the stations coming in now relatively accurate to the dial on FM...some better than others and some cleaner than others...some have a bit of distortion and some have a bit of fuzziness with less focus but they’re all there and I’ve heard worse for sure. Even on the best channels...

I know that the issue is with the balance between TC1 TC2 TC3 and T1 T2 T3 best way to get close?

Making some progress on the FM and was able to get the stations below about 98 to come in loud and fairly focused. They also are now aligned to the dial as well. The Tuning meter deflects to the center when tuned on a station and the signal meter stays on zero. No stereo separation yet nor...

So after replacing all 3 ICs, I have AM and was able to dial it in with good full reception with appropriate meter response. The FM has static that does not fluctuate across the dial. When inspecting the points of adjustments there was definitely evidence of someone fiddling with just about...

0.015VAC on Pin 2