[Central-Electronics] 20A 6AG7 screen grid resistors

[k6jek]

This is a factory wired unit and they look original. Maybe they were a late addition by CE.

Yes, they are bypassed with a couple of BIG mica caps.  My experience with other CE gear (slicer, MM-2, 100V) makes me suspect the micas.  Some of the ones in the slicer were more resistor than capacitor, something that didn't used to happen with micas.

Don't anybody start taking things apart on my account.  I'll put in what I think they should be except higher wattage, check voltages and keep everyone posted.

Jon

On Mar 19, 2011, at 5:46 PM, TH Consulting wrote:

> Hi
> Just checked 2 of my parts 20As and both had the screen grids tied directly
> to the 300V B+. I have 3 books for the 20A  and all showed no resistors. Are
> yours bypassed with any caps?
> Tom 
> K0EOA
> 
> -----Original Message-----
> From: central-electronics-bounces at mailman.qth.net
> [mailto:central-electronics-bounces at mailman.qth.net] On Behalf Of k6jek
> Sent: Saturday, March 19, 2011 6:33 PM
> To: central-electronics at mailman.qth.net
> Subject: [Central-Electronics] 20A 6AG7 screen grid resistors
> 
> Folks,
> 
> I just got a 20A.  The screen  grid resistors for the 6AG7 are charcoal..
> My schematic shows no resistors at all, screen grids at full B+  Well
> shucks.  I think they were 180 ohms.  Sound right? 
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