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Hi all,

I'm currently repairing an RG501 ramp generator and it seems the Miller integrator, part number 155-0042-03 is faulty.

Does anyone have one of these they are willing to sell and sent to Japan?

Thanks!
Jared.

I have a couple from a badly abused 7B53A, but I don’t know if they are good. Is there a way to test them on the bench? If they prove to be good I can send you one.

— Jeff Dutky

Oh, I’m also not sure if they are -03 parts: do you absolutely need an -03?

— Jeff Dutky

The Miller Integrators that I have in the parts mule 7B53A are 155-0028-00, but I also have a 5B10N parts mule in the right serial number range to be using a 155-0042-03 part. My notes say "the main selector switch needs cleaning, entire blocks of sweep speeds no working" which suggests that some sweep speeds are working, and hence that the Miller integrator is working. I can double check that instrument to be sure that it is working.

-- Jeff Dutky

On Fri, Dec 10, 2021 at 05:56 PM, Jeff Dutky wrote:

The Miller Integrators that I have in the parts mule 7B53A are 155-0028-00, but
I also have a 5B10N parts mule in the right serial number range to be using a
155-0042-03 part.

155-0042-0x was used in several plugins and a few scopes.
For all prefixes in all instruments except 7B52 below B020000
and 5B12N below B065802 155-0028-00 is a direct replacement.

/H?kan

I saw that in the Tek ICs RPR, almost every instrument that used the 155-0042-03 parts is indicated to use the 155-0028-00 as a replacement (except for a few SN ranges of the 5B12N and 7B52 which use 050-0962-00 and 050-0518-00 respectively. What are 050-xxxx-yy parts? I'm not familiar with that prefix)

I'm going to swap the 155-0028-00s from my parts mule into a known good 7B53A to verify if they are working.

-- Jeff Dutky

On Sat, Dec 11, 2021 at 04:33 AM, Jeff Dutky wrote:

I saw that in the Tek ICs RPR, almost every instrument that used the
155-0042-03 parts is indicated to use the 155-0028-00 as a replacement

I just saw that TekWiki contributor Peter on 22 November has merged the 155-0042 into the 155-0028 article and included redirection.
Thanks, Peter, if you read this!

Raymond

Thanks for the offers and info, I'm not sure if I specifically need the -03 version.. I don't suppose Tek ever released datasheets or info on these parts?
I'll reply to those who messaged me and work something out.

On another note, after further testing it seems I also need part number 155-0056-00 too. Anyone got one of them? :)

Thanks!
Jared