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Audio > Audio Technology > Re: Amplifier P...
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Re: Amplifier Problem - Revised Schematic

by zekfrivo@[EMAIL PROTECTED] (GregS) Apr 22, 2008 at 03:51 PM

In article
<40eed3b4-a4d3-4f7e-a687-0a1e0cb9d398@[EMAIL PROTECTED]
>, EADGBE
<hwbosshoss@[EMAIL PROTECTED]
> wrote:
>
>I have just discovered that the voltage measured directly at the
>emitter leg of Q208 is a NEGATIVE voltage that fluctuates anywhere
>from -300mV to -16mV.


Thats no good.  It seemed most was OK, and I imagined you have no scope.
I was going to suggest injecting a signal at the bases of the imput stage.
Holding
a metal probe with your hand should give equal sounds from left and right
on corresponding
points of each amp. 

You are  going to have to check the Q208 more thoroughly.

greg
 




 38 Posts in Topic:
Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-21 21:08:40 
Re: Amplifier Problem - Revised Schematic
"Richard Crowley&quo  2008-04-21 21:48:36 
Re: Amplifier Problem - Revised Schematic
don pearce <nospam@[EM  2008-04-22 15:18:26 
Re: Amplifier Problem - Revised Schematic
bz <bz+spr@[EMAIL PROT  2008-04-22 07:38:03 
Re: Amplifier Problem - Revised Schematic
bz <bz+ser@[EMAIL PROT  2008-04-22 07:45:45 
Re: Amplifier Problem - Revised Schematic
"Gareth Magennis&quo  2008-04-22 08:42:57 
Re: Amplifier Problem - Revised Schematic
"Gareth Magennis&quo  2008-04-22 12:21:55 
Re: Amplifier Problem - Revised Schematic
Eeyore <rabbitsfriends  2008-04-22 12:34:19 
Re: Amplifier Problem - Revised Schematic
"James" <jam  2008-04-22 07:33:36 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 04:54:48 
Re: Amplifier Problem - Revised Schematic
"James" <jam  2008-04-22 08:05:46 
Re: Amplifier Problem - Revised Schematic
bz <bz+ser@[EMAIL PROT  2008-04-22 12:26:29 
Re: Amplifier Problem - Revised Schematic
"James Sweet" &  2008-04-22 16:49:36 
Re: Amplifier Problem - Revised Schematic
Ol' Duffer <nospam@[EM  2008-04-22 09:16:43 
Re: Amplifier Problem - Revised Schematic
John Phillips <news080  2008-04-22 14:08:56 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 06:22:28 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 06:25:04 
Re: Amplifier Problem - Revised Schematic
"Arny Krueger"   2008-04-22 09:44:01 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 07:26:42 
Re: Amplifier Problem - Revised Schematic
John Phillips <news080  2008-04-22 14:31:07 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 14:34:55 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 07:43:33 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 15:29:49 
Re: Amplifier Problem - Revised Schematic
don pearce <nospam@[EM  2008-04-22 16:35:38 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 08:17:28 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 15:51:20 
Re: Amplifier Problem - Revised Schematic
John Phillips <news080  2008-04-22 16:03:42 
Re: Amplifier Problem - Revised Schematic
"Richard Crowley&quo  2008-04-22 09:44:41 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 08:41:02 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 10:04:49 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 11:01:14 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 11:13:19 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 18:42:00 
Re: Amplifier Problem - Revised Schematic
"David Farber"   2008-04-22 11:29:34 
Re: Amplifier Problem - Revised Schematic
Eeyore <rabbitsfriends  2008-04-22 19:52:31 
Re: Amplifier Problem - Revised Schematic
EADGBE <hwbosshoss@[EM  2008-04-22 12:05:26 
Re: Amplifier Problem - Revised Schematic
zekfrivo@[EMAIL PROTECTED  2008-04-22 20:09:33 
Re: Amplifier Problem - Revised Schematic
jakdedert <jakdedert@[  2008-04-22 19:34:40 

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tan13V112 Sun Jul 6 20:20:17 CDT 2008.