Re: Tuning a pi-Network Output
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This one has GE tubes.? Not sure if those are considered the "good" ones (like the Sylvanias) or if they need more capacitance.? Hopefully I'll get to the neutralization adjustment today or tomorrow.
Thanks, Barry - N4BUQ
From: "Steve Wedge, W1ES/4 via groups.io" <w1es@...>
To: "DRAKE-RADIO" <[email protected]>
Sent: Friday, April 4, 2025 7:17:29 AM
Subject: Re: [DRAKE-RADIO] Tuning a pi-Network Output
IIRC, you need a slightly higher value parallel cap with RCA tubes.
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Thu, Apr 3, 2025 at 9:50 PM, Jim Shorney via groups.io <jimNU0C@...> wrote:
I would say your PA is not neutralized, although IIRC the parallel capacitor needed to be changed for a certain brand of tube. Someone else probably knows.
On Thu, 3 Apr 2025 21:25:37 -0400 (EDT)
"n4buq via groups.io" <n4buq@...> wrote:
> I then noticed the neutralization capacitor is fully open. I don't know if that's necessarily a bad thing but I can't help but think it should have at least a little capacitance.
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73
-Jim
NU0C
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