GU13 813 SE smps psu

[claudiomas]

last quick dirty cheap monster amp by wonderfull NOS NIB GU13
UL 900V opt 3K5 output 20W linear +-1db from 20/20Khz very nice sound
max power 1Khz=40W/8ohm
driver 6BX7 100H 40mA plate load input 6C45P-E
power supply NES350/12 modified and 3X300V/500mA industrial smps

 

[jazbo8]

Schematic and SMPS info, please.

 

[claudiomas]

schematics ? ok, schematics if you need
12V350W NES mainwell adjust current limiter for startup (0,15ohm)
HT smps special custom exclusive order for industrial use (airports and highway)
valve upgrade to come next

 

[audiowize]

You are putting 200+V on the grid of the output valve?

 

[claudiomas]

ha ha ha, look the photos, 1uF oil +10nF oil // between tubes
and also some grid bias, he he
i write schematics very fast wen i make amplifier its in my head....

 

[audiowize]

Ah, that looks better. I kept looking for the +200V grid line on the curves...

 

[rdf]

Your input stage output cap needs to move down one node. 😉

 

[ncc]

Hi everyone,

Do you think this smps from mean well can be used in this design?
HLG-120H-C500A MEAN WELL | Mouser

This module from mean well seems to have comparable specifications with the one Claudiomas is using: 300V/500ma

 

[jazbo8]

No, check the input and output voltages...

 

[ncc]

Hi Jazbo,

Could you take a look at the datasheet:
HLG-120H-C500A - Mean Well LED Power Supply 150W 500mA
https://www.meanwell.co.uk/media/productPDF/HLG-120H-C-spec.pdf

It seems to have adjustable voltage from 150-300V

 

[jazbo8]

Sorry I only saw the specs on the Mouser page where it said the output is 1-10V. But the pdf says the output is 150-300V, constant current of 500mA though, perhaps Claudio can confirm?

 

[claudiomas]

i do not now my smps are custom modified for constant voltage
from ELG150

 

[claudiomas]

Your input stage output cap needs to move down one node. 😉

way? scool books??? guru bible ???? your taste??? bla bla bla from pseudogurus?
i do not tink there its any need for nothing
i just built my amplifier and i like it so i show you
i made it in four days and its sounding now, whay you wont my open the box again to replace this cap??? K40Y9 0,47uF 630V very eavy paper in oil
next step its two 816 MOV and two small chokes and bleeder resistors , one for each channel for more open sound but first at all the look of mercury vapor!!!

 

[jazbo8]

way? scool books??? guru bible ???? your taste??? bla bla bla from pseudogurus?

He only meant that the cap should be connected to the plate not the B+.

 

[claudiomas]

hai hai hai i'm little codenfus no confused sorry apologise so of course yes
its the most elementary schematics and i done the amp directly without writing it
should say GU13 its wonderful tube and sound great
thankyou

 

[claudiomas]

well this time should be fine, somebody can redone by some design program?
the tini aluminium box reach 45/50° so need holes for air flow next to come
i try to put 816 valves but need heather transformer, little chokes and caps
no much room left, i will check lather.
for the moment sound very nice, no heather supplementary caps, only 10uF1Kv
for HT900V no feedback ,no noises so let make music
Barbara Streisand Bob Dylan Tal Wilkenfeld Amy Winehouse Bach Queyras
Alan Sorrenti sound beatyfull

 

[claudiomas]

my workshop repair buiding and more
still forget decoupling caps 0.47uF // 10uF300V
and resistor values from cathode of GU13 to grd its 10 ohm

 

[jazbo8]

An amazing collection of gear!

Redrawn Schematic:

 

[claudiomas]

hello HI thanks a lot very kind Jazbo8
schematic make sense this time
really very nice thanks
claudio

 

[jazbo8]

You are welcome, drawing it is easy, building it is the hard part. 🙂