stud mount Schottky diodes

[gretone]

hello everyone, I am looking for stud mount Schottky diodes for a 250watt amp I have to make it a class A amp, they are in the output stage, the diode are missing from the boards, I have the schematic for the amp but there is no identification for the diodes, all advice is welcome.

thank you

rob

 

[Nigel Goodwin]

Then post the schematic!.

 

[gretone]

here are the files,

thank you

rob

 

[crutschow]

here are the files,

Where?

 

[gretone]

Hi zapper,

Did you get the schematics I sent you ? if so it is CR14 & CR15

thank you

rob

 

[Galgso]

Hi zapper,

Did you get the schematics I sent you ? if so it is CR14 & CR15

thank you

rob

You don't seem to have attached the schematic to your post correctly as I cannot see it and nor can crutschow

 

[schmitt trigger]

Neither do I.

Make sure that the file has a valid extension for the forum.

 

[gretone]

hi zapper ,

please let me know if this is what you need,

and thank you both

kind regards

rob

 

[danadak]

Stud mount schottkys -

https://www.digikey.com/en/products/filter/single-diodes/280?s=N4IgjCBcoGwJxVAYygMwIYBsDOBTANCAPZQDaIALAAxxgDMFIAuoQA4AuUIAyuwE4BLAHYBzEAF9xhAExkQ2JAAsi7dgGsAngAIAJgKI7czcUA

 

[Nigel Goodwin]

Well this is a strange circuit? - what are the diodes doing?, and what are R67 and R68 doing? - and how do they survive, 2.7 ohm 10W resistors that appear to have 80V across them? (almost 3KW dissipation).

Presumably the OP is aware how hot class A amps run?, and will be massively increasing the cooling - although I'm a bit puzzled why he would want to make it class A?.

 

[gretone]

Hi ,

SAE, made a 250watt 01 series amp & a 250watt X series class A, Hypersonic amp, both amps are physically the same, ( I have two 250watt 01 amps ) But, one of them has the X series boards in it. both amps are rated at full power down to 2 ohms without forced air cooling as they have very large heat sinks like the Krell amps.

so, I thought I would try and get parts to make it a class A amp,

The parts I need are as follows :

Q15 X 2, Toshiba 2SD845 & Q16 X 2, Toshiba 2SB755

R67 X 2 & R 68 X 2

CR14 X 2 & CR 15 X 2 ( there is no identification for these stud mount Schottky diode ) My knowledge does not
extend enough to work out the which Schottky diodes I need,

At the time, SAE was using up there inventory before they sold the company, That is how I have a 01 amp with the X boards in,

All involved in helping me is greatly appreciated ,

Thank You

Kind Regards

Rob