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Old 29th April 2013, 11:22 PM   #1
M Gregg is offline M Gregg  United Kingdom
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Default OP Tx and PPP to PP change over

A quick question..

This is just a thought...if you have an amp running PPP what effect would there be changing to PP and dropping the Op tap from 8 ohm to 4 ohm and still use the 8 ohm load?

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Old 29th April 2013, 11:31 PM   #2
AJT is offline AJT  Philippines
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lower power...
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Old 30th April 2013, 08:36 AM   #3
M Gregg is offline M Gregg  United Kingdom
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Any thoughts,

On the change in distortion? THD etc...the amount of Iron in the core running at lower power..Etc?
Do you think the distortion / performance of the OP Tx would be the same at lower power using two tubes or higher ?
(Same performance just lower power)?

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Old 30th April 2013, 08:58 AM   #4
M Gregg is offline M Gregg  United Kingdom
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The idea is..

OK ...we have a PPP amp running 8 power tubes..using a switch 4 of the power tubes are shut down heaters off relay change over of OP setting..

Any thoughts...? If a high value resistor is put across the OP of the Tx it should remain stable..OP tubes set with DC bias.

Any thoughts about Cathode isolation..turning off the Cathode with a FET...or is it not necessary?

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M. Gregg
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