A Question concerning vacuum tubes

[bsco]

To km6xz::::: Thank you for taking the time to reply to my question.....It has been very helpful and your explanation is very informative....and you did not insult me....I commend you!!! It is people like you, Enzo, 52bill, g-one, hodgy, and all the SENSABLE people out there...thank you for all your help so far.....I really appreciate it very much.......
Cheers,
Bernie

[km6xz]

No, he is checking his own gear and using a tech to repair and set up his amplifiers

[popoahi]

why did I get this in my gmail???
guess it's suppose to go to this SGM??? I think..
well I hope this guy who wrote this post wasn't directing it at me??

pls keep me out of the war......

[bsco]

@popoahi....no man ..nobody is insulting you sir....I had originally started this post and I had only asked for some information...basically I was told that I wasn't fit to repair anything.......

[soundguruman]

Yeah, what a friggin riot act.

I saw a post that SGM made on another forum.
The OP wanted to know about a Behringer powered speaker tweeter replacement.

SGM told him to go down to Radio Shack & purchase a piezo.

Uhmm, the replacement diaphragm is the same as what is used on a Mackie & widely available.
And it is not a piezo.

Dear uninformed lost person,
Most manufacturers are using piezo tweeters. That's not my decision.
Including "Ampeg" Peavey, GK, SWR, and many others.

Radio shack is selling the same exact piezo for about $20.
You can take that diaphragm off the piezo, and repair any of the above. It's the same exact part.
It has the same screw holes, spacing, etc...

If you don't want the piezo, spend more money on something else.

That's good advice for a person who has $20 to spend.
If you have $200, then buy a JBL.

But don't throw your darts at me for making a realistic practical suggestion.
Especially when it comes to a poor musician who only has $20.

You attacks are malicious. You enjoy attacking me because it's popular among your friends.
Have fun. It demonstrates your true 9 year old mentality.

While you have been attacking,
I have been here fixing hundreds of guitar amps.
And that's more than you could ever hope to accomplish. (because you don't have the capability that I have, or the experience)

And every one of my customers is happy with my work. Every one of them.

How many guitar amps did you fix today? I can guess: zero.
And that's what you have accomplished with your attacks. zero.

That's cause you are all noise, and no action.

[soundguruman]

why did I get this in my gmail???
guess it's suppose to go to this SGM??? I think..
well I hope this guy who wrote this post wasn't directing it at me??

pls keep me out of the war......

You can unsubscribe from the thread at any time.

But there is some useful information, if you separate it from the crap.

[Jazz P Bass]

Mackie/ Behringer tweeter diaphragm.

[Jazz P Bass]

Piezo Disc.

[Enzo]

There is no point, JB, he is either delusional or enjoying his little game too much to respond to anything like evidence. The guy is Cliff Claven, nothing more.


Congratulations SGM, you claim that while he was attacking you - two whole days ago - you have been fixing hundreds of guitar amps. Not bad. At the minimum - 200 - that would be 100 a day. Now I know you probably work harder than all of us, so maybe 10 hour days instead of 8 hours. That is 10 amps an hour. Really, seriously, that is darn good work. An amp repaired every six minutes. Why I bet that is some sort of record. In fact as skilled as you are, why not contact the Guinness people and see if they would come to your shop and watch this process. Get you a nice mention in the next Book of Records.

But there is some useful information, if you separate it from the crap.

Now THAT is hilarious.

[Enzo]

Jazz, make sure that is an 8 ohm piezo disc. Wouldn't want to upset the crossover...

[bsco]

SGM forgot to mention......he is the one posting the crap......

[J M Fahey]

Why guess when the answer is visible?
In July 2011 SGM was struggling to repair a Hartke 550 amp.
Her referred to the problem as "parts are esplodin'and stuff" (highly technical language ) , could not google *VERY* common Japanese transistors because he ignores how the names are written ("2S" prefix is not written because it's a given .... for a Tech ), and accused Samson of not providing full boards for replacement (because he couldn't *troubleshoot*)
In his full glory:

at BassDogs.com
SOUNDGURUMAN says:
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Thread: 5500 HAS EXPLODING CAPACITORS, (any mod or parts to prevent this?)

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07-21-2011, 09:40 PM #1
soundguruman
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Default 5500 HAS EXPLODING CAPACITORS, (any mod or parts to prevent this?)

Yo dogs,
Is there any Hartke genius(es) that have a mod for the 5500 power amp module? Parts be esplodin and stuff!
This is a HA3500 power amp board V1.2
Does anybody stock these transistors, or do you just use NTE whatever...?
C 3198
C 4370
A 1837
A 1266
So far I got 11 parts on this board that burned, is this normal? But all the outputs are good. Seems like the PNP final driver shorted and took everything previous out.
Is there any replacement P amp modules, or are you on your own out there? Any insight appreciated, thanks.
(from repair shop swine)

It took him SIX MONTHS to repair 1 (one) amp !!!!!!!!!!!!!!

01-24-2012, 07:02 AM #2
soundguruman
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I think after looking at this I will answer my own question. I have posted this for future repair techs...
1. The amp was designed to run on 100 volts AC (Japan), in reality... running it on 120 V is pushing it. It is labeled 115 volt, and with normal house current in USA, this is 120 volt.
2. This causes the amp to run hot.
3. The heatsink design is IMHO inadequate, not beefy enough.
4. The fan speed is controlled by a thermistor, and the thermistor is mounted in a spot where it does not detect the full heat of the heat sink. This results in the fan running too slow, and it does not speed up when it needs to.
5. The heat sink is designed so that the first transistor (close to the fan) is being cooled, but all the heat is being moved (to the exhaust vent) to the last transistor, at the end of the heatsink. This makes the end (last) transistor on the heatsink, as hot...
6. There is bias, but it is designed like a Hi Fi amp, not a guitar amp.
There is nothing wrong. I have compared it side by side with a stock amp, and there is no difference, they both get hot, identical design and operation, in both amps.

There are NO replacement amp modules, although it was built as a modular, plug in, field serviceable amplifier.

And so now we will run it.

Last edited by soundguruman; 01-24-2012 at 09:56 AM.

And even so, his "troubleshooting" is hilarious.
Such as stating the "the amp overheats because it was designed for 100V lines"
Which by the way he maintains to this day, also extending it to Ampeg, Crate, and in general any and all Asian made amps.

So rest at ease, you have been technically challenged .... by a brain challenged guy

[Jazz P Bass]

The guy is Cliff Claven, nothing more.

I love this episode of Cheers, where Cliff is on Jeopardy.
Cliff Clavin on Jeopardy - YouTube

[Jazz P Bass]

Forum bully!

[Enzo]

Y'know, it's a little known fact there, uh that scuba diving causes pressure on the brain. In fact it compresses the brain until parts of it overlap. So the poor brain winds up putting things together that don;t belong. Unrelated topics combine. Oh yeah, affects most of them. Especially ones deluded into thinking they know electronics.