Thoughts on Audio Research D70

@Hifigeek1 you are talking about the 270k drop resistor R75 thats a protection bleeder across the main B+ filters right? I cant seem to find a 27k in the schematic. Is that a WW or a Carbon comp?

Hmm I think I found it, goes from ground to pin4 of TL071, big 7W WW resistor. 26.4k and holding stable no change with tapping.

That's the one. Also make sure you measure 10 ohms at ground to common tap at output transformer.

all measured OK. Thanks HifiGeek1 for the pointers.

Took me 2 hours to carefully pull all the wondercaps and Relcap coupling caps out, and another 2 hours almost to install k40y9s into the amp (size and metal casing does NOT help at all).
The foggy when low volume and glare at high volume problem is mostly gone.
I get a lot more natural and airy sound with strings.
More to do but at least this IMO is going absolutely the right direction.

Here's an FYI. I own a D115MkII and called ARC about putting KT120's in the amp. They said don't do it as the heater in the KT120 draws alot more current than does the 6550s. He said that this will kill the power transfer over time. I would think that the D70 would also be in this camp.