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Author Topic: Don T......you're needed  (Read 8461 times)

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Offline Don T.

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Don T......you're needed
« Reply #14 on: January 31, 2003, 05:40:51 pm »
kevin:
 You either have bad power transistors or the predrives Tip 29 & 30 might be toast. Do not forget the bias transistor (little guy held to the heatsink by a srew and clamp.
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Don T.

If it's too loud, you're too old.

Offline Don T.

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Don T......you're needed
« Reply #15 on: January 31, 2003, 05:44:37 pm »
Kevin:
 The SA power amp schematic has a page about how to set the bias on the powerboard so you mught want that too.
http://www.sunnamplifiers.com/schematics/sa21_bias.jpg
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Don T.

If it's too loud, you're too old.

Offline Don T.

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Don T......you're needed
« Reply #16 on: January 31, 2003, 05:45:43 pm »
Kevin
Is you powerboard a 20-0135 or a 20-0166?
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Don T.

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Offline XoFFoX

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I'm bach
« Reply #17 on: January 31, 2003, 07:54:35 pm »
Hey Don,
Sorry Iv'e been away from the puter fer a bit. Have had a chance to look at power brd some more.
Powerbrd is a 20-0135-3G.
With the pre brd disconnected checking voltages
main rectum fryer output good at +43 and -43 VDC.
Voltages at TIP30 are: Base > -14.7V
                            Collector > -43.5V
                               Emitter > +7.5V
So it looks like there's a problem there and that's a far as I've gotten on that.
I really hope I don't have to mess with the bias xsistor as I don't have a damn scope !!!
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Offline XoFFoX

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One more thing
« Reply #18 on: January 31, 2003, 07:58:52 pm »
Oh yea,
Not sure if I mentioned that power transistors are removed at this time.
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Offline Don T.

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Don T......you're needed
« Reply #19 on: January 31, 2003, 10:37:52 pm »
Kevin:
 Well, You'll just have to keep checking backwards. That 14.7 does look suspicious. Tip 30 tweaked but since it looks like the base is at supply volts then I would guess the transistor before the tip is shorted or possibly the bias transistor or circuit problem.
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Offline XoFFoX

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Headway
« Reply #20 on: February 01, 2003, 12:47:34 am »
Hey Don
I removed TIP30 to test out of circuit and get no diode drop across Base/Emitter junction. TIP is Toasty O'd.
Other TIP29 good as +15v supply OK.
Just have to find a replacement in my scrap box.
Hope that's it for trouble but I'll know soon.
Since yer in Portland I guess yer in my time zone
PST ??? non ??? oui ??? Are you a night owl ???
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Offline XoFFoX

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Still Hackin
« Reply #21 on: February 01, 2003, 04:15:19 am »
Hey mon . . .
Well . . . I got signal from pre ch A but not pre ch B.
Actually there is a signal but it's quite weak and distorted.
Still haven't installed power transistor yet. ( wanna get Ch B workin)
I think it's one of the op amps or maybe the inverter in the drive section.
Also getting signal at master pre out but only when plugged to Ch A.
Whats the scoop on that damn bias transistor ???
Like I said before I don't have a scope unfortunately and I have a feelin I gonna hafta tweak that thingy.
Any advice would be great.
Will somebody answer that damn phone !!!
 :o
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Offline XoFFoX

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Hmmm ???
« Reply #22 on: February 01, 2003, 04:21:43 am »
I'm almost tempted to keep this damn thing for all the brain energy
I had to put into fixin it cuz I know I ain't gonna get paid squat fer it.
Unfortunatly, I don't have the box it came in with the speaker and such.
Hum Hum Hummm !!!
Humalong Herman's greatest hit.
Jerry . . . Hello !!!
Will someone answer that damn phone !!!
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Offline XoFFoX

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Oh Man !!!
« Reply #23 on: February 01, 2003, 07:36:02 am »
Well . .. I blew it !!! I couldn't leave well enough alone. I had at least one channel goin then I had to pursue the one that wasn't.
I ended up fryin both channels now. I don't know if it's one them 4069's which I can get tons of them. It's the MC14506B I can't get right away anyway. I think I can get a few ordered here in Vancouver.
I knew I should have left it alone . . .



Shit ~
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Offline XoFFoX

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Don T......you're needed
« Reply #24 on: February 01, 2003, 07:39:31 am »
The other thingy thats crappy is that I don't have the proper tool for removing the DIPS. . . eeeggghhh !!!
I hates that Rabbit !!!
 :evil:
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Offline XoFFoX

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Don T......you're needed
« Reply #25 on: February 01, 2003, 07:41:09 am »
Channel A still works only for about 30 seconds or less then cuts out.
666
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Offline XoFFoX

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Just Sittin here . . . fumin !!!
« Reply #26 on: February 01, 2003, 08:05:02 am »
Man I'm pissed !!!
I wanna throw it in the garbage !!!
But I can't . . . why . . . why . . . why !!!
Because Jesus Christ bruised the head of Stan or was that Satan ???
I can't remember . . .
If you are here tonight and you have drunk enough alcohol to float a ship . . .
You can hold yer head high and you go to church and sit like a knot on a log.
WHy . . . WHy . . . WHy . . .
Because . . . if yer here tonight and you have drunk enough alcohol to float a ship ???
. . . I digress . . .
and I think the Scorpions still kick butt !!! So what !!!
Good night and Thank you !!!! or was that  . . .
Thank You and Good night ???
I can't remember again . . .  it's been sooo long since I've been in the limelight. Wait a minute . . . I've never been in the limelight  ???
I really gotta cut out the diesel fumes . .. .
or the addiction I have to Free Energy and Anti Gravity devices . . .
hint hint !!!
Well . .. Ok I admit it . . . I'm addicted to multiples of 11
There
11:11
see ???
how bout 777
or 333
0r 666
or 999
or
111
222
555
444
Hmmm ???
Withe me it's always in 3's but divide that by 11 and what do U have ???
I dunno
I just work here . . .
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Offline XoFFoX

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Sorry can't help it !!!
« Reply #27 on: February 01, 2003, 08:41:42 am »
I'm sorry . .. I can't help it.
I love typing to myself . . .  it's another addiction I have.
Kinda like Jello pudding and Koala Bears.
IS there anyone out there who likes pears ??? Australia ???
Bzzzzzz ahhha bee baa too taa  zee tooo lee ma sa ta ruu daa !!!


There was a slight problem with the shuttle . . .  they lost it  !!!
 Lost then found . . . how can that be ???
It's a mystery . . .  and so is the battle about to bee . . .
What is insane and what is true pain . . .
Gotta get down too it . . .  Soldiers are cutting us down
Shouda bin done long ago
What if you knew her and found her dead on the ground ???
La da da da da da lallalal dadad  da da  !!!
La dee da da da !!!
I bet you don't have a CD as good as this one.
It's a killer queen
Just like the lepro scene . . .
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