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"Other circuitry" is a risk too. The field can induce voltages in nearby wiring, so you want to stay away from the amplifier front-ends. I had trouble with this when I was modifying a 500-series Type W plugin to use 6DJ8's instead of 8416's.

Dave Wise
________________________________
From: [email protected] <[email protected]> on behalf of ChuckA <chuck@...>
Sent: Saturday, May 4, 2024 8:28 AM
To: [email protected] <[email protected]>
Subject: Re: [TekScopes] 503 HV Transformer

Yep,

Gonna mount it on the opposite side of the CRT, full metal plate between
them.

Have a oversize temp transformer there now with no issues.

ChuckA

On 5/4/2024 11:22 AM, Dave Wise wrote:

Before you drill mounting holes, experiment with orientation in case the field gets into the CRT or other circuitry.

Dave Wise
________________________________
From: [email protected] <[email protected]> on behalf of ChuckA <chuck@...>
Sent: Friday, May 3, 2024 9:30 PM
To: [email protected] <[email protected]>
Subject: Re: [TekScopes] 503 HV Transformer


To finish this thread the problem ended up being leakage from the CRT
filament winding in the LV transformer.
Seems I didn't "hear" Alberts description of the problem until I got an
email from Ferrous Steinka and the light went on.

I removed the CRT leads from the LV transformer and all the voltages
from the HV transformer came on and stayed on.
I connected a spare transformer I had to the CRT leads and now have an
excellent display on the CRT.

I was able to find a NOS 6.3V transformer with 3KV isolation for $5
that should fit on the bottom of the scope cabinet.
And another TEK scope joins the "herd"

Thanks to everyone who shared their ideas on fixing the problem

ChuckA

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