Cary SLI-80 tweaks and improvements?

Decooney,

I have a couple of other questions:

1) When installing the 4 Hexfreds, do they just replace the standard diodes that are there, while retaining the tube rectifiers, or are they meant to replace the existing tube rectifiers all together?  The installation "diagram" doesn't say anything about this.

2) I can't seem to locate a Grayhill volume control pot mentioned anywhere such as a part number or anything on Cary's website.  Would you have that info, as well?

Thanks for all the replies and help, so far!

1) yes, you are replacing them as I understand it.  Best to ask Cary what they do.  Personally I like the tube rectifiers but I'm sorta old school in my thinking perhaps.  

2) Grayhil is the updated input selector switch, as pehare noted above.  

I'm not sure where my local tech sourced the volume control and he's long retired and out of all that now. Just doing the caps, input selector, silver wiring at the back to one set of inputs and possibly speaker terminal too can help.  

As noted, there is nothing wrong with the stock form amp, has it's own warmed signature the stock way too. The new/upgrades add a bit more transparency and detail IF that's what you are looking for. Some are NOT.  A personal taste imo.    I originally had the Jensen oilers in mine and later went to the Mundorf caps. The older-older gen1 version Jensen oilers should be replaced, they had some batches fail years back. This leaned many to try the newer Mundorfs that had different results most seem to like.  Best to go for it and listen, see if you like it or not.  

I actually like the tube rectifiers as well.  They just look cooler, in my opinion.  😎 

I was looking at this photo which shows the internally modified bits and it appears that it matches the diagram I have where the Hexfreds replace the existing standard cylindrical diodes.  It shows the rectifier tubes are still in place on this example:

Cary Audio SLI-80 Signature Stereo Tube Integrated Amplifier - The Music Room (tmraudio.com)

I can see what Cary has to say for clarification, just to make sure, though. 

Cary informed me that the hexfreds just replace the existing diodes and the tube rectifiers stay.

Also, does anybody know the plate voltage in these?  I can't find a stated value any where.  It would be helpful for trying different tubes.

I found the plate voltage for mine.  Measured it at 588v.  So for future reference, there it is.