[AMRadio] Can you have Class D and Class E tube amps?

Mike Sawyer w3slk at verizon.net
Tue Dec 27 07:16:07 EST 2016

I think W2ZM uses one of those on 160M frequently. I remember seeing one. If
memory serves me the plate is actually kept at 0VDC potential and the
cathode is where the HV is applied. Audio input is fed via fiber optic to
maintain isolation(?). I'm just going from a one-time explanation from 25
years ago.


-----Original Message-----
From: AMRadio [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Rob
Sent: Tuesday, December 27, 2016 6:36 AM
To: Chris Wilson
Cc: amradio at mailman.qth.net
Subject: Re: [AMRadio] Can you have Class D and Class E tube amps?

Unless I am mistaken the Continental 314 was a class D tube rig.

The 314 employed three 3-500Zs--two in the final PA and one as a switch.

It was a 1000 watt medium wave AM broadcast transmitter and there are a few
that have been converted to ham radio by hams who know how to do it.

The thing about that rig that sort of makes me think twice is that the h.v.
supply is 8 KV.  I don't know enough about class D to tell you why.  Of
course with lower power, it might not be so high.  I'm okay with high
voltage but beyond 5 or 6 KV there can be surprises.

I know of no class E tube rig and I don't know anything about class E and D
but study the Continental 314 design.



> I am a UK ham experimenting in a costly way with FET based PA Class D 
> and Class E amplifiers on LF (136kHz). My naive question is can a tube 
> based amp run Class D or E, or are the modes limited to semiconductor 
> amplifiers at these or any other frequencies? Thanks, slightly off 
> topic I know, but I believe you AM aficionados know about this sort of 
> thing? Thanks and a happy Christmas and a healthy and prosperous new 
> year to all. 2E0ILY
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