[ARC5] [MMRCG] Hello R1155 Fans

[Al Klase]

Hello Jacques,

I believe that the 6K8 and CV1099 are interchangeable.  But, can't swear 
to it.  However, here are the drawings I just dug up:



Pin-outs look the same to me.

Al*

*
ARK Sig Block Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/
On 12/20/2022 9:31 PM, Jacques_VE2JFE wrote:
> ARK Sig Block
>
> Hi Al,
>
> In the R1155, V4 is not a 6K8, it is a Osram X66 (CV1099 / VR99) and 
> this tube cannot behave as a 6K8 because the grid 1 and 3 are 
> interchanged between the two types.
>
> *73, Jacques, VE2JFE in Montreal*
>
> *De :*MMRCG at groups.io <MMRCG at groups.io> *De la part de* Al Klase
> *Envoyé :* 18 décembre 2022 16:28
> *À :* MMRCG at groups.io; ARC-5 <arc5 at mailman.qth.net>; 
> milsurplus at mailman <milsurplus at mailman.qth.net>
> *Objet :* Re: [MMRCG] Hello R1155 Fans
>
> Hi Dave,
>
> Thanks for the video.  I don't know much about the LO pulling except 
> from, just now, looking at the schematic. The cathode and grid-return 
> of the triode section of V4 go directly to ground.  So it's hard to 
> see when the interaction comes in.
>
> The first thing I'd do is swap out V4, a 6K8, in case there is some 
> internal leakage from the AVC'ed signal grid..
>
> A stitched together copy of the N-schematic is attached.
>
> This was another case of the original .pdf's I was working with being 
> locked up so I couldn't extract the images. However, today there is an 
> easy fix for that:  Printing the file using Microsoft "Print to PDF" 
> gets you an unlocked copy.  Extract the schematic images a .png's and 
> stitch them together using "Image Composite Editor" another free 
> marvel from Microsoft .
>
> Merry Christmas,
> Al
>
> *Al Klase - N3FRQ
> Jersey City, NJ
> **http://www.skywaves.ar88.net/ <http://www.skywaves.ar88.net/>*
>
> _._,_._,_
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