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91
Amplifier Discussion / Re: Identifying a resistor
« Last post by Enzo on December 15, 2018, 10:39:05 PM »
I see 1-0-x0.01, so 0.1 ohm then 5%, and the final black band is something I don't care about like temperature stability.  (250k ppm/K)


But then I am sitting on my couch drinking beer...
92
Amplifier Discussion / Identifying a resistor
« Last post by jpcar on December 15, 2018, 09:54:20 PM »
Can anyone help identify this resistor?

Pic attached
It appears to be Brown, Black, Silver, Gold, Black.

Maybe the Silver is Gray, in which case a resistor calculator I found online would say that it’s a 10.8 Ohm at 1% tolerance. I’m skeptical.
It’s from a power supply. And is blown open, as it’s reading infinite ohms on the multimeter.

Any other ideas how to read it?
I’m assuming it starts with Brown, since they usually don’t start with Black - it being zero.

Thanks.
93
Amplifier Discussion / Re: Peavey Filter Caps
« Last post by phatt on December 13, 2018, 04:50:35 AM »
This has all the hall marks of a mechanical fault.
Sounds like you have a loose connection, Gently wiggle jumper cables and see if you can find where the issue hides.
A cracked solder pad on the pcb can also give intermittent drop outs.

Gentle taps or pressure on the pcb with a wood kebab stick can help you find those gremlins.
Cracked solder pads or cracked tracks can be hard to see so
Close inspection in bright Sun Light as well as a magnifying glass will help sniff those issues out.

I once went bonkers trying to find an intermittent issue with a PCB and after hours of head scratching I turned the lights off and then went to turn the amp off.
As I turned off the amp with open chassis I saw a little flash of light under a power Cap.

Bingo,,, a hairline crack in the copper track hard up against the solder pad of the main filter cap.
Almost impossible to see even when looking straight at it as the crack followed the edge of the solder, a slight darker carbon burn was the only sign.

I once read a comment from a teck book that said a large part of electrical problems are in connections, whether they be a plug or solder or wire connection a large part of electrical breakdowns are in connections.
After years of fixing Muso gear I agree. 8|
Phil
94
Amplifier Discussion / Re: Peavey Filter Caps
« Last post by Tennerondack on December 12, 2018, 09:57:41 AM »
Well Phil I return with big  ??? .
I finally got a few minutes. Put the power and preamp boards on top of the case, connected everything fired it up and everything worked. ?!?!
Maybe I jarred the right physical connection.
I' ll take it  :tu: Now I will have to check out sound quality, I may be back.
So far even lucking out, many thanks !
95
Amplifier Discussion / Re: HH IC100L schematic anyone?
« Last post by maxkriz on December 12, 2018, 05:22:35 AM »
Much appreciated, thank you sir!  and a happy X-mass.
96
Amplifier Discussion / Re: HH IC100L schematic anyone?
« Last post by dmeek on December 11, 2018, 09:02:10 PM »
Here it is:

97
Amplifier Discussion / Re: HH IC100L schematic anyone?
« Last post by g1 on December 11, 2018, 12:00:22 PM »
I have only seen for the IC100 :  https://www.ssguitar.com/index.php?action=dlattach;topic=4500.0;attach=8135;image
For the 'L' version, I think you would have to buy it from maj electronics.
98
Amplifier Discussion / HH IC100L schematic anyone?
« Last post by maxkriz on December 11, 2018, 08:49:54 AM »
Hi there, will appreciate anyone sharing this as I could not find it on the web.
Got a sick HH IC100L that I'm trying to fix.
Thanks in advance
Max
99
Amplifier Discussion / Re: Fried Ampeg SVT-200T
« Last post by Used.Benz.Parts on December 07, 2018, 02:57:06 PM »
Hi again,
Had some free time this morning, so I got the PCB (with the pots and inputs on it) out of the case and ohmed out the 0dB, -15dB, Effects Send, and Return jacks ... and they were all high resistance due to corrosion on the contacts.
Got ‘em cleaned up with a small file and contact cleaner, checked the tension on ‘em with the patch cable (making sure they opened and closed - several times), and rechecked the resistance: 0.40 ohms on ‘em all.
Put it all back together...

It works. Still a little crackle from the Squier due to patch cord contact at the output of that bass, but the Dean sound comes through nice and clear.

Guessing the years of use before I got my hands on it was the culprit.

Thank you guys so much for your help. I really didn’t know where to start, but now she’s up n running and I’m happy.

Thanks!
100
Amplifier Discussion / Re: Peavey Filter Caps
« Last post by Tennerondack on December 06, 2018, 08:59:01 AM »
Thanks Phil you are correct I have limited understanding but catch on quickly.

Your help is greatly appreciated. I am gradually learning.
I am going to get a signal injector and have at it.

Many thanks.    T .
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