Date: Thu, 22 Jun 2017 19:41:37 +0300
From: Vic Rosenthal <k2vco.vic@gmail.com>
To: Jim Thomson <jim.thom@telus.net>
Cc: amps@contesting.com
Subject: Re: [Amps] Solid State Amps-v- Tube Amps
I don't know why it would affect harmonic suppression, but it does add
inductance to the "parasitic tank circuit" that is formed by the plate lead,
blocking cap, and pi input capacitor, which could make VHF parasitics more
likely.
Vic 4X6GP
## Yikes, forgot about the dreaded... parasitic tank circuit. But having
said that.... never an issue if the small coil was on a 160-15M amp.... ( to
get a lower Q on 15M on my 3CX-3000A7)..... that coil was aprx .66 uh. Or
thye small coil used on a 80-10m YC-156 amp....or the small coil used on a
160-15m 3x6 amp. In the 3 x6 amp, the tune cap was tapped in exactly one
turn into the main 20-17-15 m tubing coil. And no suppressor used at all on
any of those 3 tubes, nor a 8877, GS35B either.
## But on a 20 or 40m monoband amp.... I would be asking for trbl.....so its
best left out.
Jim VE7RF
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