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  2. HV Power Supply - 7704A - Neon Bulbs

Re: HV Power Supply - 7704A - Neon Bulbs

n4buq
 

Mark,

On the subject of the HV supply, I seem to recall an email (which I can't find) where you mentioned a suitable replacement for C4201 (8.2uF, 200V). I presume anything around 15uF to 25uF and, maybe, a slight increase in the voltage rating would be okay but thought I'd ask before ordering.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Barry" <n4buq@knology.net>
To: "tekscopes" <TekScopes@groups.io>
Sent: Monday, October 4, 2021 9:07:58 PM
Subject: Re: [TekScopes] HV Power Supply - 7704A - Neon Bulbs
Hi Mark,

I was just about to post that the older manual shows a 5AB-T for those. I plan
to replace all four in that board (along with the caps). I have a box of A9A
leaded bulbs but, unfortunately, those are the wrong striking voltage for this
application. So close...

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Mark Vincent" <orangeglowaudio@gmail.com>
To: "tekscopes" <TekScopes@groups.io>
Sent: Monday, October 4, 2021 9:02:51 PM
Subject: Re: [TekScopes] HV Power Supply - 7704A - Neon Bulbs
Barry,

A 5AB is a direct replacement for a NE23. Mouser has these in stock. Get several
to have spares on hand. Broken leads at the base of neons is common.

Mark
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