100W Vox Vigilante Power amp assembly question

Thread Starter

julian demaria

Joined Mar 19, 2019
2
Hi i'm new in the cummunity ! I'm creating this thread because i was attempting to build up a 100W power amplifier from some circuit diagrams that i have found in this link :https://www.korguk.com/voxcircuits/
The diagrams of the preamp and the power amp can be found In the section of 1990's amplifiers.
I had a problem with some of the components shown in these diagrams and wanted to know if someone can give me a hand and tell me what they are and if it's possible, their functioning.

Thank you in advance !!!

These are the circuit diagrams with the marked components:

prequest.jpg questamp.jpg
 
The first component is a transformer for isolation and ground loop elimination. Probably 1:1. 10K to 10K should be a common part.

You have an inductor and resistor in parallel near the speaker. It's usually made with a 2W carbon resistor and about 10 turns of #22 wire wrapped around it. It's a guess. It helps the amp cope with inductive loads.

Your other components may be 1/4"" phone jacks. Lots of different arrangements exist. Possibly some varient of http://www.switchcraft.com/Category.aspx?Parent=1010 There are internal switched contacts. A common example is to disconnect the internal speaker when the plug is inserted..
 

Sensacell

Joined Jun 19, 2012
2,435
1) Spring reverb unit- ?
2) looks like switches to route signals?
3) may be contacts of a relay- speaker protection circuit?
 

Thread Starter

julian demaria

Joined Mar 19, 2019
2
The first component is a transformer for isolation and ground loop elimination. Probably 1:1. 10K to 10K should be a common part.

You have an inductor and resistor in parallel near the speaker. It's usually made with a 2W carbon resistor and about 10 turns of #22 wire wrapped around it. It's a guess. It helps the amp cope with inductive loads.

Your other components may be 1/4"" phone jacks. Lots of different arrangements exist. Possibly some varient of http://www.switchcraft.com/Category.aspx?Parent=1010 There are internal switched contacts. A common example is to disconnect the internal speaker when the plug is inserted..
THANKS A LOT !!! Now i can finish the board design and continue with this proyect !! About the legends near the symbols, it's very difficult to read some of them because of the writing of the person that made these diagrams it wrote some words with the letters very close and it's very confusing. Anyway you can see them in a better resolution from the original link.

https://www.korguk.com/voxcircuits/
The diagrams of the preamp and the power amp can be found In the section of 1990's amplifiers.
 
At least I can blow up that diagram.

The resistor I think is 6R8 2W meaning 6.8 ohms 2 W Carbon Composition or carbon film. Seems difficult to get.

The other thing near the speaker might be a switch. You might make it a relay and use a push button of your choosing. It might be a push button switch with multiple poles. The diagram is missing the actuator. Draw an imaginary vertical line through the middle and stop at the last line. Then draw a horizontal line at the top. That would be your actuator. Still guessing.
 
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