[Amps] Quad Tube 4cx800 hf amp

[PA3DUV]

Another way to reduce power is to work the operate/standby switch of the 
amp.
In 99% the approx 60 watt from my exciter are sufficient to establish or 
maintain communications.
However, when needed a flick of the switch  kicks in additional 20 dB 
amplification which has so far proven to be sufficient to convey the message 
that the frequency was occupied.

Cheers, Dick
PA3DUV


----- Original Message ----- 
From: "R L Measures" <r at somis.org>
To: "Peter Voelpel" <df3kv at t-online.de>
Cc: <amps at contesting.com>
Sent: Saturday, May 27, 2006 1:55 PM
Subject: Re: [Amps] Quad Tube 4cx800 hf amp


>
> On May 26, 2006, at 3:02 PM, Peter Voelpel wrote:
>
>> Phil,
>>
>> The 8660 is the equivalent to the 4CX1500B,
>> The driver tubes are 8122 I found out.
>>
>> Again, if I drive a 8171 to not more then 1,5KW output ever,
>> it should be tuned for that power, not for 20KW
>
> However, if an 8171 is tuned for max suds in AB1, it is easy to back
> the mic. gain down to the point where it produces 1500w in Class A --
> resulting in superb linearity.  In the event that more power is
> needed to communicate, one merely advances the mic. gain.  In the
> event that 1500w is too much, one can run barefoot or turn down the
> mic. gain even more.  .
>>
>> 73
>> Peter
>>
>>
>> -----Original Message-----
>> From: Phil Clements [mailto:philc at texascellnet.com]
>>
>>
>>
>>> You are claiming that two 8660 tubes drive another pair of 8660
>>> tubes?
>>
>> No, there is only one pair of driver tubes in class A.
>>
>>
>>
>>>
>>> The original posting meant eventually that the output network
>>> should be
>>> adjusted for the power to be operated and not to that the tubes are
>>> capable
>>> of.
>>
>> I disagree with that premise.
>>
>>> That does not mean that parts could not be oversized.
>>
>> Bigger is usually mo bettah! I over-engineer everything.
>>
>>
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>>
>
> R L MEASURES, AG6K. 805-386-3734
> r at somis.org
>
>
>
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