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DIY 300B budget power supply

Hi everyone!

First of all sorry for my English , I write you from Switzerland! thank you for your indulgence ;-)

I have just realized the Budget DIY 300B and I haven’t fully turned it on yet

This is the DIY 300B budget but in 2 mono blocks

I test the power supply built according to the site plan and I just connected the GZ34 for now to control the voltage

at the output of the power transformer there is 770v then after rederessage GZ34 and filtering as on plan i get 522v!!! and not 430v as shown . What is the problem?? there will be a problem with the capacitors limited to 500v!

Thank you for your help Frank

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15 Comments

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Ed Muffler

Jan 28

All the pics didn’t load initially for me before. I now see the Hashimoto output logo. Are the Edcors power trannies you talked about under some metal cases or are these different NOS transformers? I am sure they sound as good as they look!!

frank crax

Jan 29

Replying to

Hi Ed

i have the Hashimoto output H20 7U transformer direct from Japan 5000ohms.

Under some metal cases there is Edcor XPWR 144 760v 200mA 6.3v 3.5A and 5v 3A

Both are insulated for operating vibrations

Box alone weighs 10kg total 18kg each!!,12mm thickness ,made with solid aluminum wings airbus A380!!!

Russians Tubes PX300B and GZ34 Genalex Golden Lion , 6SN7 GTB low noise Tung-Sol

For my handy work “under the hood”

The box is closed and I have to unscrew everything to show you, I would do that it will be possible

My total system Tv samsung 8K, home cinema Onkyo tx NR818 ,NAD C272, drive CEC TL51, DAC Cambridge magic plus ,front KEF XQ40 ,rear Eltax ,center Magna ,sub JmLab ,Cambridge Azur 651P , phono Lenco LBT 188 (i have to change!!!!😉) cable Qed, Oehlbar ,Inakustik that's all !!

all sounds very well 😍

if you return to Switzerland, tell me