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Amp Casulity

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Mr. M-500t

(pair of) SILVER-7 TUBE AMPs

Posts: 6211

Joined: Fri Mar 17, 2006 10:00 pm

Post Sat Oct 01, 2011 12:49 pm

Re: Amp Casulity

That sucks ! Now what ?
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Zoot Horn

User avatar

SILVER-7 TUBE AMP

Posts: 3231

Joined: Thu Nov 15, 2007 7:26 pm

Location: 4th Tower of Inverness

Post Sat Oct 01, 2011 1:16 pm

Re: Amp Casulity

I suppose I'll send it to someone who has better skills than I do.Not to be short,,just kinda frustrated with it. ](*,)
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jerryj12

User avatar

TFM-6cb

Posts: 206

Joined: Sun Aug 24, 2008 12:30 am

Location: Atlanta, Area

Post Sat Oct 01, 2011 2:42 pm

Re: Amp Casulity

George, gimme a call sometime maybe we can put it on the bench here.
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mbskeam

User avatar

SILVER-7t

Posts: 1984

Joined: Mon Jan 25, 2010 2:32 am

Location: Woodinville Wa

Post Sat Oct 01, 2011 2:56 pm

Re: Amp Casulity

do you have a multi meter?

does it get B+ 450v (big cap)

on the output tubes:
pin 9 355v
pin 7 415v
pin 3 14.53v (bias)
pin 2 V2= .002v pin 2 V3= .01v not sure why this voltage is not the same, maybe a typo???
input tubes:
pin 1,7 76v
pin 6 275v
pin 3 .359v

all these voltages are right at the tube socket pins

put heat shrink on your prob tips so that only the very end shows, you will thank your self latter on.... :-"
Mbskeam


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Zoot Horn

User avatar

SILVER-7 TUBE AMP

Posts: 3231

Joined: Thu Nov 15, 2007 7:26 pm

Location: 4th Tower of Inverness

Post Sat Oct 01, 2011 3:36 pm

Re: Amp Casulity

Thanks Mike,, allright,,I'm going in,,,gotcha on the heat shrink
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Mr. M-500t

(pair of) SILVER-7 TUBE AMPs

Posts: 6211

Joined: Fri Mar 17, 2006 10:00 pm

Post Sat Oct 01, 2011 3:38 pm

Re: Amp Casulity

Zoot Horn wrote:Thanks Mike,, allright,,I'm going in,,,gotcha on the heat shrink
:lol: :lol: :lol: :lol: :lol:

Get're Done Boys ! [-o< [-o< [-o<
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radioeng2

User avatar

SILVER-7t

Posts: 1345

Joined: Fri Jan 26, 2007 7:06 pm

Location: E TN

Post Sat Oct 01, 2011 5:07 pm

Re: Amp Casulity

To add my readings....

While set to 120vac input....

Outputs...
Pin #9 - 384vdc
Pin #7 - 437vdc
Pin #3 - 13.6vdc

Inputs....
Pin #1 &7 - 87vdc
Pin #6 - 294vdc
Pin #3 - .39vdc

All readings with no audio drive, inputs not shorted, outputs loaded by 8 ohms.

One additional is the voltage across the screen dropping resistor (the big blue one) is 56vdc. This amount of drop indicated the total screen draw for all 4 output tubes.

My filament voltage at the transformer output (at the terminal strip) is 6.4vac.

Mark
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tinpan

User avatar

TFM-45

Posts: 583

Joined: Tue Jan 05, 2010 7:48 am

Location: Spotsylvania, VA

Post Sat Oct 01, 2011 7:07 pm

Re: Amp Casulity

We're pulling for ya Zoot. I hope you can get it sorted out.
Tinpan

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