Type: Posts; User: Jazz P Bass; Keyword(s):
As to the issue of pulling Vdc to power the fan, it really does depend on the power supply.
I had a PRO Audio power amp (2 in fact) in that had a 7mv hum on the outputs.
It went away when I...
Here is the schematic with the correct orientation of Q6. (it is a NPN transistor)
Edit: The LTP (Q3 & Q4) where drawn as PNPs when in fact they are NPN transistors.
Thank you for the schematic J M Fayhey!!!
I could not find this oddball version anywhere.
Kudos to MEF.
I got one of these jewels in with the MJE1102/ 1092 transistors installed.
Of coarse they...
"Black Face" a Silverface amp?????
WTH is that supposed to mean?
What, remove all of that gadly wire?
I found a few pics online.
The third pic shows the amp connector.
It appears that the lower pin is larger than the other two.
That is going to be a tough one to find.
Here is the power amp schematic of the Power 10.
There is indeed a zener across a capacitor.
16V / 1/2 watt.
And the complete schematic: 55894
What do the two pads connect to?
The Power 10 shows a 'D5" being a 12 V zener diode.
Looking at the schematic I notice there are a number of 0.1uf bypass capacitors on the IC power rails (C42-C45).
One or more may have gone short.
Try contacting them: https://www.altoproaudio.com/contact
Here is the SM: 55866
The bottom half of the output is being cut off.
If you look at your voltages you will see a lot of Minus dc measurements.
That is hint.
That said, solid state amps can be a real bear to repair....
That is how it is supposed to work for this test.
I was trying to determine, by removing Q1, if the issue was in the switching voltage.
Not too sure why you localizing on the DeOxit.
MSDS: Health Hazard: 1
Skin Exposure: may cause Dermatitis.
Where thin gloves.
I would be more worried about the lead in the solder.
How safe is it?
The MSDS rates the Health hazard as 1.
Other than the 'trade secret ingredients', the only issue that I see is the Naphtha.
Here is the TV-120 schematic.
It may help.
Q1 mutes the clean channel when On.
If you remove it, the switch position should not influence that channel.
There should no longer be any connection to the switch voltage.
So how can it make the...
"Removing the Q1 the amp stays on clean, regardless the position of the switch. When the switch is out (clean selected) the hum is present, as showed in the video. But when the switch is in (drive...
Chuck. I had one of those newer tower self powered speaker thingies in with 'crackly' controls.
Can't seem to remember the brand.
Called the manufacturer and he said 'believe...
Just received the Caig Deoxit.
As advertised, they are the 'old' can.
Here it is in pdf format: 55805
Be aware that U6 is in the feedback path of the output. (pin #6).
Also the - speaker connection should not be considered as at ground potential.
There are those 2 .22 ohm resistors in there...
Here is a schematic of the WM10 with discrete output devices.
Not too sure about "but power FETS for the output." as this schematic shows bjt outputs.
I don't know, it says "CAIG D5S-6-LMH DeoxIT Spray 5 oz. Original Can".
I will advise when I receive it (I bought 2)
Are you certain that the Intensity Pull switch is stock?
That sounds to me like a Cesar Diaz mod: Pulling the switch disconnects the vibrato circuit (with a 'pop')
The Volume pull switch...
I would remove Q1 jfet and see what the amp does.
Of coarse the Clean channel will always be On.