2K, 2K4 and 2K3 did not use the roller coil arrangement.
73
Jim W7RY
--------------------------------------------------
From: "DJ7WW" <dj7ww@t-online.de>
Sent: Saturday, December 11, 2010 10:20 AM
To: <amps@contesting.com>
Subject: Re: [Amps] Band switch
> As far I know all Henry amps made use of roller inductors
>
> 73
> Peter
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Dennis OConnor
> Sent: Samstag, 11. Dezember 2010 18:47
> To: amps@contesting.com
> Subject: Re: [Amps] Band switch
>
> Hsu, those multi deck band switches bring hot RF carrying wires from the
> hi-power tank circuits, close together which is not desirable... Yes, I
> understand that it has been done that way from the early days of ham
> radio,
> but it is still a poor way electrically...
>
> As far as the switch you show, from the pictures it looks like it is well
> made from quality materials..
>
> Let me make a suggestion that you take a look at how Henry Radio handled
> the
> RF switching on the tank circuit on their remote tune 3/4/5/8 K series of
> amps... The band switch for the tank coils would be a single pole, 6
> position switch, that pulls in relays elsewhere in the tank (grid)
> compartment...Henry hand made their own high current (and high voltage
> bypass on the plate supply RF choke) relays using linear pull, AC
> solenoids
> and adding the RF contacts onto the solenoid rod...
>
>
> denny / k8do
>
>
>
>
>
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