VintageKustom.com
VintageKustom.com is your source for literature and information on the tuck-and-roll vintage Kustom amps from the 60's and 70's, as well as their related products such as guitars and organs . We provide a webboard for help with kustom gear history, technical information and repairs as well as discussions with other collectors.
Home » VintageKustom.com » Repairing Kustom Amps » Transformer info (output voltage on k25-2 )
Show: Today's Messages :: Polls :: Message Navigator
Switch to threaded view of this topic Create a new topic Submit Reply
Transformer info [message #18994] Sun, 21 July 2013 08:15 Go to next message
chimike is currently offline  chimike
Messages: 2
Registered: February 2013
Junior Member
Hiya,
I'm hoping someone here can help . I have a lovely little k25-2, with a blown mains tranny. I'd like to replace it with a Toroidal, as the one on my K200b is as quiet as a mouse, What I need to know is the output voltage of the original, plus the tolerance, as I may not be able to get an exact match.
Thanks Mike

Report message to a moderator

Re: Transformer info [message #18995 is a reply to message #18994] Sun, 21 July 2013 11:47 Go to previous messageGo to next message
pleat is currently offline  pleat
Messages: 1453
Registered: June 2004
Location: Belding, Mi
Senior Member
IF you go to the technical tab on the left it will bring up a page where you can call up the K25-2 schematic. As best as I can tell, it shows 25.2 volts.
pleat

Report message to a moderator

Re: Transformer info [message #18997 is a reply to message #18994] Sun, 21 July 2013 13:54 Go to previous messageGo to next message
chicagobill
Messages: 2005
Registered: April 2003
Senior Member
Welcome to the place.

Pleat is right, the power supply is designed to be approx. plus and minus 25 volts dc. If you take that figure and multiply it by 0.707 you get roughly 18 volts ac.

So I would imagine that a 36 vct transformer rated at 1.5 to 2 amps would work for you. Of course you will have to have a primary winding that works for your location.

Best of luck with your repair.

Report message to a moderator

Re: Transformer info [message #18998 is a reply to message #18994] Sun, 21 July 2013 18:36 Go to previous message
chimike is currently offline  chimike
Messages: 2
Registered: February 2013
Junior Member
Thanks for the help, guys. I'll go for an 18 + 18v as suggested.
Next on my repair list will be my Sidewinder jbl ! Seems that people in England don't realise these amps run on 120v, The k25 's fuse saved the day, but the Sidewinder power amp took a hit ! preamp seems fine !
Best Wishes Mike
PS found the circuit diagrams now, thanks.

Report message to a moderator

  Switch to threaded view of this topic Create a new topic Submit Reply
Previous Topic: Identify That Cab
Next Topic: I believe my K200 A5 PA may be overheating
Goto Forum:
  

-=] Back to Top [=-
[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Sat Jun 29 01:31:16 EDT 2024
.:: Contact :: Home ::.

Powered by: FUDforum 3.1.3.
Copyright ©2001-2023 FUDforum Bulletin Board Software