Unusual Watkins Westminster 1958

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Unusual Watkins Westminster 1958

Postby Pitchfork on Thu Jun 30, 2016 3:14 pm

Has anyone got a schematic for a 1958 Westminster with following valve line-up?
2 x ECC83 (12AX7)
2 x EF86
2 X EL90 (6AQ5)
1 x EZ81
I am led to understand that the type only existed for a short time & some were built using the famous 'V' type cabinet of the Mk1 Dominators, mine is in the more conventional Westminster cabinet covered in Grey & White Rexine, patterned with stars
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Re: Unusual Watkins Westminster 1958

Postby stratele52 on Thu Jun 30, 2016 5:51 pm

Look there are many Westminster, no one I found with your tubes;
1958 Westminster, 5 tubes
http://el34world.com/charts/Schematics/ ... r_1958.pdf


Look here, lots of Watkins / Wem schematic
http://el34world.com/charts/Schematics/ ... matics.htm

http://bmamps.com/Tech_sch.html
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Re: Unusual Watkins Westminster 1958

Postby Pitchfork on Thu Jun 30, 2016 7:12 pm

None of the published ones have the aforementioned valve line-up which is why I'm asking here in the hope that someone has this version & has reversed engineered it already
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Re: Unusual Watkins Westminster 1958

Postby stratele52 on Thu Jun 30, 2016 7:31 pm

Some pictures of the amp may help.

Are you sure it is a 1958 Westminster ?
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Re: Unusual Watkins Westminster 1958

Postby Pitchfork on Fri Jul 01, 2016 8:25 am

That's the date stamped inside the cabinet
I'll endeavour to take some photos but there is a description of such a variant (albeit in a 'V' shaped Dominator cabinet on the Vintage Hofner Web-site)
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Re: Unusual Watkins Westminster 1958

Postby stratele52 on Fri Jul 01, 2016 9:29 am

Maybe it is not a Westminster 1958 but a xxxxxxxx amp made in 1958.

Picture may help or some link.
I have a Wen Dominator, great amp.
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Re: Unusual Watkins Westminster 1958

Postby Pitchfork on Fri Jul 01, 2016 9:38 am

Definitely a Westminster
There were several iterations of the circuit before they settled on the ECC83/ECL82/EZ81 version
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Re: Unusual Watkins Westminster 1958

Postby stratele52 on Fri Jul 01, 2016 10:40 am

If I was you, I'll look here at each Westminster schematics

http://bmamps.com/Tech_sch.html
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Re: Unusual Watkins Westminster 1958

Postby Pitchfork on Fri Jul 01, 2016 12:32 pm

Already done that & there is nothing similar shown
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Re: Unusual Watkins Westminster 1958

Postby stratele52 on Fri Jul 01, 2016 1:01 pm

Pitchfork wrote:Already done that & there is nothing similar shown


Bad news !
Many '50 area amp did not provide schematic

You need schematic because amp didi not work ?
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Re: Unusual Watkins Westminster 1958

Postby Pitchfork on Sat Jul 02, 2016 9:20 am

It works but need to improve quality
I'll just have to reverse engineer it!
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Re: Unusual Watkins Westminster 1958

Postby stratele52 on Sat Jul 02, 2016 10:38 am

I have a few old amps which they are working good but I don't like the sound to much but thats its their ownans original desing and should I modify them or keep it original as a piece of history ?
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Re: Unusual Watkins Westminster 1958

Postby Pitchfork on Sat Jul 02, 2016 10:42 am

It's things like noisy components that I need to trace e.g. resistors, not to fundamentally change the circuitry
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Re: Unusual Watkins Westminster 1958

Postby stratele52 on Sat Jul 02, 2016 11:59 am

Noisy resistor are each tube's plate resistors, no schematic needed just tubes layout.

Many old amp don't have input shorting jacks to ground, this will make noise. A replacement input jacks will fix it.
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Re: Unusual Watkins Westminster 1958

Postby drewphotoboy on Tue Sep 12, 2017 8:30 pm

Hi Pitchfork

Did you get anywhere with your search regarding a schematic for your Unusual Westminster??

I have a similar unit with the same mix of valves (EL90s), two channel (clean plus tremolo) - also heard that very few of these were made (Charlie Watkins is quoted as saying they only made 'about ten' of these...) and have not been able to locate a schematic. Very few schematics seem to be around for Westminsters in general (given how many different versions there are) and I've not found one for this twin channel type let alone the EL90 version - did you have any luck? or manage to figure it out yourself?

I'm wanting to replace some modern replacement caps and resistors with period components at the correct values and take it back to original if I can.

Have found a few photos online of circuit boards which go some way in helping...

Any help appreciated.

Thanks
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