It may be that his friend was talking about audio amplifiers where tubes in
push-pull can be run class B, giving greater efficiency than the
single-ended parallel design which must be run class A or close to that.
Regards, Mike N4NT@chartertn.net
----- Original Message -----
From: "Tom Rauch" <w8ji@contesting.com>
To: <amps@contesting.com>; <firson@Radiolink.net>
Sent: Tuesday, July 25, 2000 6:53 AM
Subject: Re: [AMPS] PushPull
|
| > Some friend told me that runing tube on pushpull will be give bigger
power
| > than parallel (for two tube). I don't really understand, could anybody
| > here give some explanation.
| >
| > de Firson - YD1BIH
|
| For RF amplifiers, if you are operating the tube close to the upper
| frequency limit, push pull can help stabilize the PA. It also reduces
| even harmonics.
|
|
| For power output, as a general rule, there is no difference at all.
| Your friend was not correct in the typical case in RF PA's.
|
|
|
|
| 73, Tom W8JI
| w8ji@contesting.com
|
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