[Amps] Dual tetrode in grounded grid

[Carl]

I thought this was for 222 mHz?  RG-58 loss is about 8dB per 100' and 
you dont need that much attenuation. If you want short try RG-174 or 
RG-178.

I had to go the other way with my HA-2 and HA-6 since I am driving them 
with about 10 milliwatts out of a pair of TS-830's. Added a 2N5109 Class 
A buffer amp which tickles the 12BY7's just fine.

Carl
KM1H



----- Original Message ----- 
From: "Glen Zook" <gzook at yahoo.com>
To: <Amps at contesting.com>; "Carl" <km1h at jeremy.mv.com>
Sent: Thursday, February 12, 2009 12:38 PM
Subject: Re: [Amps] Dual tetrode in grounded grid


> The only problem with using RG58/U is that you are going to have a 
> pretty large coil.  Also, resistors are definitely a lot cheaper even 
> though I buy RG58/U in 500 foot spools for making the interconnect 
> cable kits for various radios that I sell.
>
> One "trick" that works when using tube type equipment is to put a 50 
> ohm load to ground on the input and then "tapping" this with a fairly 
> small value capacitor.  Hallicrafters did this with the HA-2 and HA-6 
> to allow the use of 100 watt exciters and I did this on the input of 
> the transmitting converter to drop the 8 watts from the exciter to 
> about 2 watts that is required by the mixer.  Cheap and dirty, but it 
> does work!
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
> --- On Wed, 2/11/09, Carl <km1h at jeremy.mv.com> wrote:
>
> RG-58 also makes an excellent attenuator
>
>
>
>