|Author:||Paul Fawcett (registered user: 3236 posts )|
|Date:||Wed, Feb 29th, 2012 @ 08:43 ( . )|
On 02/29/2012 @ 08:11, Zozobra wrote :
I've updated the schematic with a few tweaks:
: Corrected the bias circuit
: Decreased the bleeder/balancing to 220k such that the sum of R20/21 is less than 10xR27 as per Merlins suggestion.
: Added the power switching/fusing to the diagram including an inrush reduction standby.
: This is the same location as the old diagram so any previous links will be updated too :)
The PSU is a bit under-filtered by modern standards. Corner frequency for screen node is 3.4 Hz, only 10.6 Hz for node E.
I don't know what the voltage differential is that you are hoping for between plate and screen, but KT-88s are often run with screens well below the plate, especially for high plate voltages.
--* Poweramp/supply design
2/29/2012 @ 08:55--Zozobra
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