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Posted

Hi all,

 

over the weekend, i have picked up a used vintage valve amp.. it has 2x kt66 tubes, 4x 6j5 gt on the main amp section, and 1x 5as4 aj tube on the power section...

 

it is 2 pieces power module and amp section and in between there is an umblical cord with 6 round pins (similar to tube bases)

 

on the main body there are also 2x dials that show mA which i am assuming it is for bias adjustment..(they have the date of 1959 on it!)

 

next to kt66 tubes there are 2x 6.3 mm (large socket) mono inputs...

 

also next to the amp there is a pot and under it there is another socket for 6.3mm jack insert...

 

i think this might be a monoblock, but this thing is very heavy... on the amp section there is a massive transformer and from the bottom it says "partridge transformers ltd type cfb/o/17"

 

Anyone knows what this amp might be, and recommend me someone in sydney who can check if it is working or not?

 

From the same place i have also picked up a few different bits and pieces (horn cells, compression drivers, tweeters etc) so i will be posting them with my silly questions shortly...

 

post-139629-0-19412300-1411380055_thumb.

 

  • Like 2

Posted (edited)

Score!

That's a mean looking amp.
Anything underneath it?

 

And what about the horn cells etc?.............and where did you score all this great stuff from?

 

edit - sounds like old theatre gear to me.

Edited by LogicprObe
Posted

The amplifier is most likely to be based on the  Williamson circuit since the  Partridge O/P transformer  appears to be  a 10K Ohm P to P model.There is plenty of information on the internet for this amplifier model.

  • Like 1
Posted (edited)
bottom of the power section..


bottom of the main section


 

amp upside down :P (i am on mac and it is too hard to rotate it)


 

i also got a 6 and an 8 cell horn.. one of the driver is western electric 30150 d which apparently is quite rare.. the other driver is relosound su-12... its a shame they are not a matching pair... but both works very well...

 

horn with relosound driver


 

western electric driver inside


Edited by jdog
  • Like 1
Posted (edited)

could anyone tell me if the amps is mono or stereo by any chance?

Edited by jdog

Posted

The amplifier is most likely to be based on the  Williamson circuit since the  Partridge O/P transformer  appears to be  a 10K Ohm P to P model.There is plenty of information on the internet for this amplifier model.

 

http://www.r-type.org/articles/art-107c.htm

 

it is a williamson amp! and it is mono by the looks of it..

  • Like 1
Posted

Looks Good find--good luck with the refurbish--yes anything with WE attached these days is Gold--I think! :D

 

Willco

 

post-139629-0-37917600-1411381883.jpg

  • Like 1

  • 1 year later...
Posted

Did you get around to restoring the interesting Williamson amp and power supply?

 

With the CFB style output transformer, the amp is circa 1951 onwards.  The KT66's are most likely not original to the amp, as they are tan base ( >1952), and clear glass (>1961).

 

The top-deck wiring is probably heater distribution, in an attempt to lower hum - that's definitely quirky!

 

I've got two Williamson's nearly fully restored. Your amp looks like its from a nice kit - does it use aussie parts?

 

Ciao, Tim

Posted (edited)

Did you get around to restoring the interesting Williamson amp and power supply?

 

With the CFB style output transformer, the amp is circa 1951 onwards.  The KT66's are most likely not original to the amp, as they are tan base ( >1952), and clear glass (>1961).

 

The top-deck wiring is probably heater distribution, in an attempt to lower hum - that's definitely quirky!

 

I've got two Williamson's nearly fully restored. Your amp looks like its from a nice kit - does it use aussie parts?

 

Ciao, Tim

 

Hey Tim, 

 

Impressive knowledge on williamson amps :thumb:  No idea if its using Aussie parts i will have a closer look tonight... Inside the front dials, i can see a date of 1959 so guessing it would be the built date (or closer to it).. 

 

I am building a house so no time to get this restored.. will definitely get this restored and use it sometime this year tho :)

 

Jahn 

Edited by jdog
  • 8 years later...
Posted

Hi Jahn,  any update on the status of this Williamson ?  It has a cousin using the same unique construction style/layout, so trying to eek out more details 🙂

Ciao, Tim

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