VintageKustom.com: Repairing Kustom Amps » K100-2 Hiss but no other output

Home » VintageKustom.com » Repairing Kustom Amps » K100-2 Hiss but no other output (Need help troubleshooting)

Show: Today's Messages :: Show Polls :: Message Navigator

Return to the default flat view

Create a new topic

Submit Reply

K100-2 Hiss but no other output [message #21116]

Mon, 11 August 2014 09:45

Jerrybass1955 is currently offline

Jerrybass1955
Messages: 45
Registered: August 2014
Location: NC

Member

Hi Folks,
Just signed up for this forum, so please pardon me if I am covering old ground.
I recently picked up a steal on a K100-2 head with reverb and Tremolo. I have only taken a brief look at it so far. I have 40V DC at the power supply caps with no ripple measured with a VOM. The output has hiss but no signal gets through from the input. Hiss is independent of all controls. I have a signal generator coming tomorrow and I have a scope, but I am just getting started troubleshooting this guy. It hasn't run in several years at least, so I thought the Power Supply Filter Caps would be gone for sure, but they seem fine for now given that I am right on the money with the 40volts DC, (that of course may change since it may have very little load at this point).

So my questions:
1) I have a schematic, but it is very hard to read. Anyone have a relatively clean schematic they could share?
2) Anyone have suggestions on where to start troubleshooting this guy?
3) I assume the output transistors are probably OK since I get some hiss, but maybe someone knows otherwise?
4) Are there routine things some of you would replace for good measure given the age of this beast? It would be nice to keep it near original, but that is kind of useless if it doesn't work!
5) Are there any tricks to tearing this guy down to troubleshoot it that I should know about?

I appreciate any input you folks can give. This amp is like my first serious amp when I was maybe 14 years old or so. I later switched to bass and ran a K200 bass amp. Both have long since been sold, so this will be quite nostalgic for a 58 year old guy if I can get it running. I will likely be working on it at most a half hour or so a day average, so I may be posing more questions from time to time. I am looking forward to interacting with this group.
Thanks,
Jerry

Report message to a moderator

Send a private message to this user

[Message index]

		K100-2 Hiss but no other output By: Jerrybass1955 on Mon, 11 August 2014 09:45
		Re: K100-2 Hiss but no other output By: daveobergoenner@gmail.com on Mon, 11 August 2014 11:22
		Re: K100-2 Hiss but no other output By: daveobergoenner@gmail.com on Mon, 11 August 2014 11:30
		Re: K100-2 Hiss but no other output By: stevem on Mon, 11 August 2014 12:59
		Re: K100-2 Hiss but no other output By: C4ster on Tue, 12 August 2014 08:40
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Tue, 12 August 2014 09:18
		Re: K100-2 Hiss but no other output By: stevem on Tue, 12 August 2014 10:32
		Re: K100-2 Hiss but no other output By: daveobergoenner@gmail.com on Tue, 12 August 2014 10:55
		Re: K100-2 Hiss but no other output By: C4ster on Tue, 12 August 2014 11:54
		Re: K100-2 Hiss but no other output By: stevem on Tue, 12 August 2014 12:08
		Re: K100-2 Hiss but no other output By: daveobergoenner@gmail.com on Tue, 12 August 2014 12:38
		Re: K100-2 Hiss but no other output By: stevem on Tue, 12 August 2014 15:37
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Tue, 12 August 2014 21:05
		Re: K100-2 Hiss but no other output By: stevem on Tue, 12 August 2014 21:13
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Thu, 14 August 2014 10:35
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Fri, 15 August 2014 14:12
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Fri, 15 August 2014 22:47
		Re: K100-2 Hiss but no other output By: daveobergoenner@gmail.com on Sat, 16 August 2014 00:30
		Re: K100-2 Hiss but no other output By: chicagobill on Sat, 16 August 2014 03:07
		Re: K100-2 Hiss but no other output By: stevem on Sat, 16 August 2014 09:15
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Sat, 16 August 2014 21:00
		Re: K100-2 Hiss but no other output By: chicagobill on Sat, 16 August 2014 21:32
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Tue, 19 August 2014 12:04
		Re: K100-2 Hiss but no other output By: chicagobill on Tue, 19 August 2014 12:49
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Tue, 19 August 2014 22:22
		Re: K100-2 Hiss but no other output By: daveobergoenner@gmail.com on Wed, 20 August 2014 09:58
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Wed, 20 August 2014 12:02
		Re: K100-2 Hiss but no other output By: chicagobill on Wed, 20 August 2014 13:39
		Re: K100-2 Hiss but no other output By: daveobergoenner@gmail.com on Wed, 20 August 2014 23:10
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Thu, 21 August 2014 13:52
		Re: K100-2 Hiss but no other output By: daveobergoenner@gmail.com on Thu, 21 August 2014 16:45
		Re: K100-2 Hiss but no other output By: stevem on Fri, 22 August 2014 06:51
		Re: K100-2 Hiss but no other output By: Jerrybass1955 on Fri, 22 August 2014 11:44
		Re: K100-2 Hiss but no other output By: daveobergoenner@gmail.com on Fri, 22 August 2014 15:35

Previous Topic:	trem-vib distortion on my k150-8 and k100-8
Next Topic:	Do I actually have a Frankenstein??

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

PDF

]

Current Time: Mon Apr #d 21:55:31 EDT 2024

.:: Contact :: Home ::.

Powered by: FUDforum 3.0.9.