1960's Instrument amplifier identification

[phlox]

Hi All , just a quick question.

I stumbled across an old amplifier i had laying around that i want to fix, but literally cant find anything on internet about it.

The amp is a Vingtor K4T amplifier from norway, dates back to 1960's, sticker inside for last checked date was 1969.

I found a K3T version but no schematics or diagrams either , but according to what i found on the K3T its a instrument amplifier.

Anyone perhaps have info on it or know the amplifier?


The amp works, sort of, i need to replace caps inside that are leaking, and figure out why it plays for a few minutes then sound starts distoring. It has 2x 2n3055 transistors on output, which have 2 light bulbs connected in series with base or emitter, cant remember now, which i take it is for constant current maybe?. at first power up it has about 27v on the transistors which slowly go down to about 7v then the lights start shining brightly and sound is distorted.

 

[kellys_eye]

i need to replace caps inside that are leaking, and figure out why it plays for a few minutes then sound starts distoring.

kinda answered your own question there I reckon!

 

[phlox]

those leaking caps i did replace, but not sure of the other as they dont show physical signs of damage , but ill check them as well.

but does anyone know the brand Vingtor?

 

[kellys_eye]

Vingtor are otherwise known as Vingtor-Stentofon and suppliers to the marine industry of communication and amplification devices.

I used to fit their kit on new-build ships (oil tankers etc).

Post a pic of the amplifier - it might ring a bell or two in my aged mind....

 

[phlox]

ill send a pic as soon as it get it on the pc.

Last night though i got it fixed, sort of, found the original capacitors and put them back (after 8 tears of being packed away in a box).

Didnt work at first but then i saw a 25K ohm pot whose wiper contacts were not even touching the rest of the pot, bent them a bit so that they touch again and she fired right up, works well, but just might have to replace that pot as its very sensitive.

 

[phlox]

 

[kellys_eye]

Well the logo on the front panel is familiar but that piece of equipment looks to be early 70's and pre Vingtors move towards marine gear. It's lot older than the stuff I used to work with, that's for sure.

I think you might get some success by contacting them directly for information - they were always helpful when 'we' called them for assistance with marine gear - and they might even have an interest in that piece of equipment for historical (perhaps hysterical...) reasons.

Some of the Scandanavian electronics companies have fairly large fan bases, the likes of SP Radio A/S (Denmark) etc and I'd be surprised in Vingtor didn't have some form of historical appreciation society somewhere.

 

[phlox]

I will contact them and ask. It has two stickers inside when the amp was checked last, one is in 1969 and other one in 1971 if i remember correctly.

All info so far that i could find is about the K3T model where mine is a K4T.

https://zwentzen.wordpress.com/2010/02/10/vingtor/

Ill have a look if i can find a fan base or site like you suggest.