[Amps] The power of an oversized electrolytic capacitor /

[Leigh Turner]

All good points Carl.

When I use my RF speech processor the Po and Ip come up to almost static
values and represent a roughly steady load on the HV power supply.

As for residual ripple, tube amps have a pretty good PSRR and are not at all
fussed by a few percent ripple on the HV plate supply.

Leigh
VK5KLT

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Carl
Sent: Sunday, 20 May 2012 1:55 AM
To: Jim Thomson; amps at contesting.com
Subject: Re: [Amps] The power of an oversized electrolytic capacitor /

For you folks that go on and on and on abt diminishing returns,  why don't 
you toss the arrl book in the trash..and find out for yourselves.

later... Jim   VE7RF
---------------------------------------------------------------------

Since that is the only part of your statement that isnt a steady 
repeat....youre starting to remind me of Rich....here is my reply.

At say 2500VDC a 25V ripple is only 1%. Who can hear it, even as an AM 
linear? Sure another 10X reduction looks nice on a scope but our ears arent 
so sensitive.

Its the same with an audio amp, to a speaker or as a modulator. If the low 
level input signal is clean so will the output even if the ripple isnt as 
good in the amp.

IMD reduces a bit as regulation improves but how much?  Ive asked you this 
many times but never an answer.

With most store bought amps having 8-12% idle current to full PEP regulation
how much IMD improvement is there in each 1% improvement? The few tests I've
done here using the eyeball and then the Peak Hold method on the SA while
inputting a voice track into the exciter shows under 1dB using a TS-940 and
TS-950SD which have excellent IMD to start with....sometimes better than the
amps published specs.

It also tells me what the RF speech processor contributes at various
settings. I now have Ragchew and Pileup settings (-;

Carl
KM1H


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