[Hallicrafters] Aligning a S-76

[Ken And Susan Hittson via Hallicrafters]

Hi Jim and the group. 
Checking back in: I validated that L6 is at 1650kc by using my signal tracer on term1 of T1. I get a perfect signal there listening to the tracer output. If I tune L6 I quickly loose the signal. I went ahead and removed the 2nd mixer box, and replaced the wires, which had become frayed, and to again check the work I did in there replacing c21 and c23, and r20 and r22. I pigtail wired the Assy up and checked tube voltages, they are as follows:
Plate 262.8 (should be 265)
G2 141V (should be 80V)
Grid -2.1
K-G5 126V (should be 1.5V)
Heater 6.27 VAC
I only hear a strong signal at the grid, using my signal tracer. The coax output has 265V on it, but only the tiniest signal. Comparing the wiring in my mixer to the schematic it looks to be correct. The K-G5 is fed from the v10 power tube, per the schematic, and hence it shows 126v, not sure why the pin voltage shows to be 80v being fed from V10...
Any advice is appreciated.
Ken


> On Aug 12, 2015, at 11:40 PM, Ken And Susan Hittson via Hallicrafters <hallicrafters at mailman.qth.net> wrote:
> 
> Thanks Jim
> I can try listening at the 1650kc freq, and I also can try using a small (goIt)  frequency counter, that has a whip antenna to measure the frequency of the 2nd mixer. One thing I found, is that if I dangle a test lead off of T1 term 1, the radio plays thru the speaker (normally) like it is cross-talking between the stages. If I move the dangling test lead loop toward V8 the radio plays very clearly. Removing the test lead results in a quiet radio. 
> Thanks Ken
> 
> 
> 
>> On Aug 11, 2015, at 1:30 PM, Jim Liles <hallicrafterssr2000 at k9axn.com> wrote:
>> 
>> Ken,
>> 
>> Try something before again removing the sub chassis.
>> 
>> Turn L6 back and forth.  If that oscillator is not very close to 1650Kc, you will measure nothing.
>> 
>> If you have a another radio put the antenna near the under chassis and tune to 1650Kc to see if the oscillator is running and at what frequency.
>> 
>> Regards Jim
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