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[Amps] Solid State Amps-v- Tube Amps

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Subject: [Amps] Solid State Amps-v- Tube Amps
From: "Jim Thomson" <>
Date: Fri, 23 Jun 2017 17:13:31 -0700
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Date: Thu, 22 Jun 2017 19:41:37 +0300
From: Vic Rosenthal <>
To: Jim Thomson <>
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 

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 its 
best left out. 

Jim   VE7RF
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