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  1. Sticky: This is the transformer I purchased from CE...

    This is the transformer I purchased from CE Distribution https://www.cedist.com/products/transformer-fender-replacement-output-8-w-32-ohm

    Looking at the wire diagram for the transformer above, its...
  2. Sticky: SOLVED!!! Y'all were spot on with the wires on...

    SOLVED!!!

    Y'all were spot on with the wires on the OT backwards. I switched the red and blue wires on the OT transformer and the squeal at 10 and 1 is gone. The amp works great in all settings. ...
  3. Sticky: Thanks for the replies. I have not tried...

    Thanks for the replies.

    I have not tried swapping the leads on the OT mainly because the supposed drop-in replacement has the same color wires as the original OT. I will try this.

    I did not...
  4. Sticky: '65 Fender Vibro Champ squel at volume 10 and 1 only

    I am working on a Vibro Champ AA764 that squeals only in the 10 position and 1 position of the volume pot. All other positions it plays GREAT!! Came in the shop with no output and power tube was a...
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    Old amps and mold

    Recently, a '67 Fender Vibro Champ was brought to my repair bench that was not working. The chassis is rusty, the tolex on the cabinet is peeling away, and cosmetically it looks like it sat in a...
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    I quit working on those because I could never...

    I quit working on those because I could never find a set of transistors that worked. You blow on those Ge transistors and their bias point changes
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    Alpha Potentiometers makes a lot of those style...

    Alpha Potentiometers makes a lot of those style pots click here http://www.alpha-product.net/en/product/Rotry%20Potentiometer/R12%20Serials/607/
  8. I'm working on a PDS-1700 and its doing the same...

    I'm working on a PDS-1700 and its doing the same thing. It kinda works after leaving it on for a good 10 minutes. I posted in the Schematic Request forum for a PDS-1700 schematic and alexradium...
  9. Thank you very much. You know, the PDS-1700 on...

    Thank you very much. You know, the PDS-1700 on my bench is barely working as I can see it slightly pulsating on my scope. Cleaning all the sockets sounds like a good place to start. I'm not...
  10. Digitech PDS-1700 Chorus/Flanger Schematic

    I would appreciate any help finding this schematic.
  11. I think I'm over biasing my EL84s; but how should I fix it.

    I recently completed building a Ceriatone 20W British amp kit... basically, a Marshall 20W 2061X circuit. I bought the kit with everything but NO Power or Output transformer and NO tubes. I used the...
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    I only know to ask this because I have done the...

    I only know to ask this because I have done the same thing... don't feel bad. We are human and easily overlook the simple things. Hopefully, that'll fix it.
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    According to the schematic, the power supply...

    According to the schematic, the power supply requires 12VAC; not 12vdc. Most laptop power supplies are 12vdc. What is your power supply providing... AC or DC?
  14. When I see weird things like this I start looking...

    When I see weird things like this I start looking at pots and jacks. Have you swapped the input jack out with a new one? I've seen the inner sleeve of an input jack have lots of dirt and debris...
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    If they only had a Quad matched JFET IC... ...

    If they only had a Quad matched JFET IC... Matching JFETs for phasers is a pain in the butt (and I'm getting lazy in my old age)
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    When I was a Roland Authorized Service Center,...

    When I was a Roland Authorized Service Center, I'd get keyboards and other digital effects in for repair with the same issue. Roland's response was that the D/A or A/D was going bad but recommended...
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    Check this one out: Davide Gironi: A CNC...

    Check this one out:

    Davide Gironi: A CNC Pickup Winding machine built on an ATmega8
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    I quit working on keyboards 1/1/2016. The last...

    I quit working on keyboards 1/1/2016. The last keyboard I repaired I had to strip everything out to replace a burnt backlight, then after putting it back together, some keys didn't work anymore. To...
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    Wow, I had no idea. I think she said she bought...

    Wow, I had no idea. I think she said she bought the keyboard in the 90's. I will search for the M150... thanks for the tip Enzo!
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    Kurzweil Mark 10 Service Manual

    Looking for the service manual for the Kurzweil Mark 10W. I need to know how to remove the keyboard to clean and possibly replace the rubber key pads. The keyboard I will be servicing has a velocity...
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    Check this youtube video ...

    Check this youtube video out. I think it is a good example of when true bypass works and when it doesn't.
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    I just completed a repair of a Royal Guardsman. ...

    I just completed a repair of a Royal Guardsman. See this thread http://music-electronics-forum.com/t36954/

    I took two Viscount cabinets along with various parts and made one good amp. What I...
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    I apologize for hijacking dNi3L's thread. I...

    I apologize for hijacking dNi3L's thread. I have created my own thread here http://music-electronics-forum.com/t36954/

    The heightened security throughout the TSA must be bleeding over to our...
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    Vox Viscount Repair/Refurb

    Picking up from this thread http://music-electronics-forum.com/t36945/
    The two Viscount cabinets model 1151 and 1153. If anyone can shed some light an the differences between the two and which one...
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    The Royal Guardsman's preamp connector fits...

    The Royal Guardsman's preamp connector fits perfectly into the power amp and it's power cord is clamped to the chassis. It almost looks like it is a direct replacement for the Viscount preamp??
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    You're correct. Both cabinets are Viscount...

    You're correct. Both cabinets are Viscount cabinets. The model # on one is 1151 and the other is 1153 (this one has the speakers)

    The 1151 is open back and the 1153 is closed back. The speakers...
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    Good question!! A client brought me these two...

    Good question!!

    A client brought me these two amps and said, "if anything, make one good Viscount out of all the parts". I haven't had the time to research what I have. I thought the Guardsman...
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    Interesting enough, I am doing the same thing but...

    Interesting enough, I am doing the same thing but with two Vox amps... A Royal Guardsman and a Viscount. I have been reading RG's excellent article on VOX amp repair at Geofex. Search for Thomas Vox...
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