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Hey all, I picked up a RM15 (rackmount 515) a few weeks ago and aside from missing most of its tubes it is in impeccable condition. What's peculiar is next to the s/n is a plate that says MOD 801C. Any and all information I can find on the 515/515A goes up to MOD 760C, and associated engineering documentation. I cant find a thing on MOD801C. Anyone hear of such a thing?

The VERTICAL POSITIONING pot looks to have been completely, and very cleanly removed. The violet striped, red striped, and black orange brown striped wires that (I assume) went to the pot were cut pretty close to the DC BAL pot and neatly tucked away.
FWIW the s/n of this unit is 002835 and on the backside of the front faceplate is written RCA 3374.

On Tue, Mar 11, 2025 at 10:29 PM, rivet_head wrote:

I cant find a thing on MOD801C. Anyone hear of such a thing?

Here's the exact text on Mod 801C from an old document (microfiche):

"Trig, 2 vert & cal paralleled to rear, BNC; ext horiz,
sawtooth & gate out paralleled to rear, binding posts;
2 gound posts added."

/H?kan

AH! thank you very much, sir.
What is the title / Tek # of that document?

On Mon, Mar 17, 2025 at 03:07 AM, rivet_head wrote:

What is the title / Tek # of that document?

It's on page 2 in the Modified Products section of the RM15 microfiche set.
Only a brief description and no schematics or detailed description.

/H?kan

I appreciate it H?kan. Information on the rack mount versions of the 500 series is pretty hard to come by.