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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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Old 5th September 2018, 10:45 AM   #221
hendrixgr is offline hendrixgr
diyAudio Member
Join Date: Apr 2018
After some testing do not buy this negative dc converter 3PC MC34063A Reverse Voltage Module Positive To Negative Voltage Convertor Lot | eBay
because it gets too hot.

The other one i mentioned is perfect +-5V 6V 9V 12V 15V 24V Positive & Negative Dual DC DC Step-up Boost Converter | eBay

Remember to select the -24v type.

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Old 5th September 2018, 01:45 PM   #222
kodabmx is offline kodabmx  Canada
diyAudio Member
Join Date: Oct 2011
Location: Toronto
Good to know. I'm just using one of these set to 110V and I drop 51V with a zener and use the rest for biasing... I originally was going to wire for Triode and needed the extra voltage. In my new 6P45S build in triode mode, I'm using the same module for bias, but I'm using an AB-4 autobiasing board from Pavel at
DC-AC Converter 12V to 110V 200V 220V 280V 150W Inverter Boost Board Transformer | eBay
Automatic bias control module for four push-pull (PP) tube AB-4. Dimensions 74x77 mm. TES

Just thought I'd let you know I reconfigured for Triode operation on my build. 300V B+, fixed bias @ 60ma per tube. Very nice sound even if it's only 27W...
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