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 » K200A-1 Power Amp Rescue Needed (Serial Number 20466)
Show: Today's Messages :: Polls :: Message Navigator
Return to the default flat view Create a new topic Submit Reply
Re: K200A-1 Power Amp Rescue Needed [message #27280 is a reply to message #27270] Thu, 25 April 2019 10:11 Go to previous messageGo to previous message
thetragichero is currently offline  thetragichero
Messages: 33
Registered: April 2019
Member
just a little update
took all of the resistors off the PC702 board one by one and tested them out of circuit
here is the list of the resistors i've changed and what they measured at (they are in the order i tested)
r704 5k7
r706 5k4
r709 38k
r703 43k
r715 540r
r730 138r
r729 165r
r715 197r (WOW almost 100% out of tolerance!)
r711 5k1
r710 2k5
r701 5k6
r702 5k4

i had previously changed any other 100r resistors on the board because they seemed to have drifted the most. they must've gotten a good batch of 1k resistors because i haven't had to change a single one

while i was in there i replaced all of the electro caps on the two preamp boards (i figured if it needs to be done eventually, i might as well strike while the iron was hot, so to speak)

fired 'er up and measured voltage across speaker jack. fluctuates rapidly but mostly in the mv to +/- 1v or so range. this is close enough for me to brave testing it later, after the hallway where my music room is accessible (replacing all of the moldy, rotten subfloor from water we took on in the past two hurricanes...)

i would've tested when i finished last night but my better half was asleep and i've made the mistake of abruptly waking her with a loud guitar chord one too many times

i'll report back after testing (might be awhile)

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: Challenger Reverb Problem
Next Topic: Kustom 100 blowing fuse
Goto Forum:
  

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

Current Time: Mon Dec 30 18:27:32 EST 2024
.:: Contact :: Home ::.

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