You will only need around 2-4W to drive the 4-400 tuned grid driven to even
beyond its capability as an AM linear, about 10W swamped grid . A 2E26 would
be loafing as the Class C final and could be modulated by any number of
tubes to provide 15-20W of audio including 2E26's, 815, 6L6's, etc at well
below their ratings.
In the 60's I operated 6M with a CE 10A driving a 815 TX converter at 15W
out and into a converted NCL-2000 at 350W out on AM and 1200W on SSB/CW.
That was swamped grid and I still use that amp at the same drive power for
SSB/CW.
Mod transformers show often on Fleabay, either fixed impedance or multitap.
Then its only necessary to match a fixed impedance to the correct tubes or
just connect the dots on a multi tap.
OTOH, why not cathode modulate the 4-400? Output will be about the same at
the savings of a plate modulator. Granted you cant benefit from exotic
processing circuitry and 125% positive peaks but its simple.
My own 6M AM rig is a 4CX250B modulated by 811A's; aka Clegg Zeus at 125W
carrier or 500W PEP. The companion Interceptor B is the receiver
Carl
KM1H.
----- Original Message -----
From: "KA4RFA" <ka4rfa@comporium.net>
To: "amps fourm" <amps@contesting.com>
Sent: Monday, September 20, 2010 6:03 PM
Subject: [Amps] 6146 or 2E26 modulator info
>
> I need to plate modulate a single 6146 or 2E26 ---to be used as a driver
> for a 4-400 6 meter amp
>
> would like any ideas on a possible readily available low power mod
> transformer and reactor as big iron I have is bad
> would rather use the DX-100 modulation method rather than the DX-60
> way -just sounds better
>
> JIM-- KA4RFA
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
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