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Re: Repair [message #28971 is a reply to message #28970]

Sat, 11 March 2023 12:21

NLKustom
Messages: 50
Registered: March 2022

Member

rodak wrote on Thu, 09 March 2023 14:35

Where did you buy the schematics at? Was it a PDF or an actual physical copy? I have a PDF, but would love to have a nice, full size foldout copy.

Always happy to support anyone selling these old schematics (as long as it's not horribly over-priced)

I bought the schematics from https://antiqueradioschematics.org/. It's in a PDF file. Price was $9.95US.
I printed them out on long paper(had to set my printer on legal).

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Re: Repair [message #28972 is a reply to message #28494]

Sat, 11 March 2023 15:24

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

If I am not mistaken any store like office max or staples can take your pdf file and print you out a larger then 8 x 11 copy of it.

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Re: Repair [message #28976 is a reply to message #28494]

Tue, 14 March 2023 13:44

NLKustom
Messages: 50
Registered: March 2022

Member

What should the ohm readings be on the reverb tank?
I'm testing my old reverb tank with the ohm meter set on 200, the lowest setting.
I'm getting 168.3ohms on the input side and 169.1 on the output side.
Is this normal or is this tank gone?
Most videos on Youtube say the input should be way lower.
Any help here on this?

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Re: Repair [message #28981 is a reply to message #28494]

Wed, 15 March 2023 12:13

chicagobill
Messages: 2006
Registered: April 2003

Senior Member

Those readings are normal for your reverb tank. They typically will read from 150-190 ohms.

Fender and some other amps use a tank that will read 1-2 ohms on the input side.

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Re: Repair [message #28989 is a reply to message #28494]

Wed, 15 March 2023 21:50

NLKustom
Messages: 50
Registered: March 2022

Member

Steve,
So I put the reverb tank back in the amp, hooked it up and everything seems to be working fine. I don't know what the tech guy fixed or replaced, but it was something on the board where the intensity pot is, there is some heat burns on the board just under the pot where he did some soldering. But I will find out.
The reverb works, don't know if it as strong as it supposed to be. I have a new tank coming from Tubes&more, is has the long delay, which according to info on this site is the proper tank for that K150-8.
I will install that one when it arrives to see if the reverb is any different.
But so far so good.

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Re: Repair [message #28991 is a reply to message #28494]

Tue, 21 March 2023 12:13

NLKustom
Messages: 50
Registered: March 2022

Member

So Update.
I still haven't found out what the tech repaired on this amp, but ever since the tone sounds different.
When playing guitar through the amp the low E, A & D strings sound muffled. And the high E, B & G strings sound very sharp.
What would cause this? if they say they never fooled with the tone part of the amp?

Other than that everything is working good.

[Updated on: Thu, 05 October 2023 18:14]

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Re: Repair [message #29126 is a reply to message #28991]

Thu, 05 October 2023 18:14

NLKustom
Messages: 50
Registered: March 2022

Member

NLKustom wrote on Tue, 21 March 2023 12:13

So Update.
I still haven't found out what the tech repaired on this amp, but ever since the tone sounds different.
When playing guitar through the amp the low E, A & D strings sound muffled. And the high E, B & G strings sound very sharp.
What would cause this? if they say they never fooled with the tone part of the amp?

Other than that everything is working good.

This is a new post

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Re: Repair [message #29127 is a reply to message #28494]

Thu, 05 October 2023 18:30

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

If you unplug the input to the tank does the old tone return?

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Re: Repair [message #29128 is a reply to message #29127]

Thu, 05 October 2023 19:19

NLKustom
Messages: 50
Registered: March 2022

Member

Never tried that

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Re: Repair [message #29129 is a reply to message #29127]

Fri, 06 October 2023 09:03

NLKustom
Messages: 50
Registered: March 2022

Member

stevem wrote on Thu, 05 October 2023 18:30

If you unplug the input to the tank does the old tone return?

Wouldn't just turning the reverb knob to the off position do the same thing?

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Re: Repair [message #29130 is a reply to message #28494]

Fri, 06 October 2023 13:05

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

No.
That's why I stated the way I did.

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Re: Repair [message #29222 is a reply to message #28494]

Sat, 02 March 2024 14:15

NLKustom
Messages: 50
Registered: March 2022

Member

Steve,
Sorry for just getting back to you.
So I unplugged the tank and removed it. Tried the amp, the tone still sounds the same. Very sharp on the high strings and sorta muffled on the lower strings. It's like a really clean sound with the guitar selector switch in neck position. In bridge position it's really sharper.
I don't know, it just seems to sound different.
I can't seem to get any info from the repair shop. Other than he replaced something in the circuit board that's next to the plexi front near the bottom middle of the circuit board. That's where the original noise used to come from. They said they didn't replace anything that would have affected tone. He had that front board apart because he broke one of the knobs removing them, one was ceased up. And the board has burned marks on it from his soldering, they said everything was very fragile and easy to break.

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Re: Repair [message #29223 is a reply to message #29222]

Sat, 02 March 2024 15:03

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

At this point I am sorry to say that I do not think I can be of any more help to you because the amps circuits need to stepped thru by a tech that has the needed test equipment and experience.

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Re: Repair [message #29224 is a reply to message #29223]

Sat, 02 March 2024 16:40

NLKustom
Messages: 50
Registered: March 2022

Member

Yes,
and that is a big problem nowadays. Finding a tech with knowledge of repairing these old amps.
Especially where I live. There is no one.
The amps is working fine otherwise, I just have to tinker with the EQ's on it and the guitar to get a half decent tone.
It's not my main amp anyway, I have it more for the nostalgia and collectability, more than anything else.

Thanks

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Re: Repair [message #29225 is a reply to message #28494]

Sun, 03 March 2024 05:21

stevem
Messages: 4775
Registered: June 2004
Location: NY

Senior Member

These are not difficulty amps to work on just because there old, they are very simple common circuits that where used even in HI FI amps of the era.
In fact in terms of HI FI and good techs you might try to locate a certified HI Fi repair and restoration shop that you could ship the chassis off to.

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