On 2019/05/12 6:05 a.m., Cursitor Doom wrote:
On Sun, 12 May 2019 11:04:06 +0000, Cursitor Doom wrote:

[...]

Sorry, guys, it's a Taylor 68A/M. I can't find the exact model on line
but this one is as close as it gets:

https://www.radiomuseum.org/r/taylor...tor_68a_2.html

The grid/Cathode bias does change with range selection; I just measured
it. There doesn't seem anything obviously amiss with the readings:

Range 8 (lowest frequency) -25V
7: -7V
6: -3.4V
5: -1V
4: -0.3V
3: -1.6V
2: -1.8V
1: -1.0

Anode is +80 to +90VDC vs. Cathode over all ranges.





If you are troubleshooting this then be aware that plate resistors often
fail high and are (after capacitors) the next suspects in repairing old
tube/valve equipment. Schematics are a huge help of course to be able to
verify meeting manufacturers BOM as older parts colours have usually
faded to obscurity....antique radio societies will be an aid in tracking
down schematics...

If you can't find a match check out EICO or Heathkit of the same vintage
as chances are someone may have copied the schematics to their product.

John :-#)#

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