CAudio SR808 |
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Sergio B
Registered User Joined: 29 May 2022 Status: Offline Points: 13 |
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as for the R24 R34 R50 resistors, I confirm that they are originally 22k 1/4 watt therefore the three must be replaced with 27k 1w |
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1110 |
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Here is an updated version of the soft / start PCB |
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1110 |
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Here is the updated protection circuitry.
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1110 |
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Here is my version of the updated driver card.
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1110 |
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The soft start PCB has updated components, including allowing you to use two versions of the 47R resistor (clad or PCB solder type) and added NTC's as well.
Also have the originals & updated versions of the following as well. RA Series (1001-3001 T03 & Plastic FET's PCB board, including all mods & re-entrant circuit added to main board & a few other tweeks). GB602 (just original main board & input PCB). ST1000 (just original main board & all other PCB's). Would like to do the RA4001 as well at some point. |
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Sergio B
Registered User Joined: 29 May 2022 Status: Offline Points: 13 |
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great job, congratulations you can put the wiring diagram with the parts list and values if you don't mind |
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Sergio B
Registered User Joined: 29 May 2022 Status: Offline Points: 13 |
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Hello
today i mounted the driver board but i noticed that the volume is lower and that the transistors
Edited by Sergio B - 30 May 2022 at 8:30pm |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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The SR808 Has 15 MOSFETS per voltage rail, so each channel has a total of 30 MOSFETs (15 X Hitachi 2SJ50 & 15 X Hitachi 2SK135.
You could try Ebay for good used ones. Beware of anything from China or any reporting to be "new", as doubtless there are fake ones around. |
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Be seeing you.
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Getting that quantity of those is nigh impossibe these days. And yes - watch out for the fakes. You might be able to find enough of the Exicon 10N/P16 or 10N/P20. They should be ok as a replacement. |
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Earplugs Are For Wimps!
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service dept Steve
Old Croc Joined: 30 January 2010 Location: S.W.London Status: Offline Points: 2034 |
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I wonder what a pulled, used but tested j50 or k135 is worth these days, us old boys have lots of strange stock tucked away
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We are not "They", We are "The others"http://www.servicedept.co.uk -
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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About £10 each going by this Steve.
https://www.ebay.co.uk/itm/374096911833?hash=item5719e9ddd9:g:NNgAAOSw7wVfFsyd |
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Be seeing you.
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Randy Bohannon
Registered User Joined: 29 May 2022 Location: London Status: Offline Points: 107 |
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Cricklewood electronics reckon theirs's are real and they want £30 for them
https://www.cricklewoodelectronics.com/2SJ50.html
The Batwing ones are where the money is: https://www.cricklewoodelectronics.com/2SJ83.html Makes me want to sell the two pairs I have in the working bank of a random 80s DIY amplifier I have and replace them with Exicons at a profit! (sorry, can't get hyperlinks to work...)
Edited by Randy Bohannon - 30 May 2022 at 5:05pm |
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