There Has to Be a Better Way.

[old_coot88]

Originally Posted by Winky Dink

?...I can't figure out why the voltage to the plate on 85 is so low. All components test OK, and I've even tried replacing the resistors 48 and 49 with new ones. Would it be worthwhile (or risky?) trying a lower resistance for the 99K resistor?

What is the (plate) voltage with the 85 removed? Does it jump up to the full 267 volts? If it does, i would try this (with the tube re-installed):

Since the 99K is the plate load resistor, shunt the 32K that's in series with it. Try maybe a 22K, a 10K, then a full shunt. That'll raise the voltage without losing signal-voltage swing across the 99K. See if this improves volume any.

...I adjusted each capacitor to obtain max noise (AM band only).

Which capacitors did you adjust? The ones in the IF cans, or the ones in the front end?

full schematic:
https://picasaweb.google.com/lh/phot...eat=directlink

Link won't come up on my rig. But found the Riders on Nostalgiaair
http://www.nostalgiaair.org/PagesByM...2/M0013822.pdf

[Winky Dink]

The full voltage did show up with the 85 removed. I tried the series of shunts, but there was no discernible change in volume. I have pretty good volume already.

The alignment was to two caps each on 1st & 2nd IF transformers, then two caps each on the three RF transformers, then the single "oscillator series."

I checked the link to the schematic, and it seems OK. I'll put it here, anyway for easier reference even though the readability is marginal.



I'm puzzled with the grid voltages--more often than not I get appropriate values, but negative instead of positive or vice versa, and it seems to work fine. On the 42s here, however, the value seems to be way off. But it still works.