VOX Westminister schematic

[bsco]

I did some searching but can't seem to find this one...it is a bass combo from from the late 60's early 70's....there is a germanium transistor...AC187 which has the legs broken off from the body......it is obsolete and of course the recommended replacements are also obsolete.....any suggestions???
Cheers

[Jazz P Bass]

Here is the Westminister V118 schematic:

[bsco]

Thanks jazz....my biggest problem with this is trying to find a suitable replacement....I may have to use a silicon transistor which would mean changing out some resistor values....any suggestions kindly welcome...

[Jazz P Bass]

Worth a shot: https://www.ebay.com/itm/20264195403...43e977dc109ae9

[g1]

Worth a shot: https://www.ebay.com/itm/20264195403...43e977dc109ae9

Sometimes if you contact those sellers they may have a more economical shipping option. That one is showing $55 to Canada.

[bsco]

thanks guys...I doubt if the shipping will be any cheaper....I will check it out.....I think I need to register with ebay...

[vintagekiki]

The Westminister V118 does not use GE transistors.

http://www.geofex.com/Article_Folders/Thomas%20Vox/Thomas%20Vox%20Replacements.pdf

1)
http://www.voxshowroom.com/us/amp/guardsman_power_amp_hood.html
Thomas Vox 60 Watt RMS Power Supply/Power Amp Module

2)
Q6 = 2N2924 NPN predriver
Q7 = 2N3054 NPN driver
Q8/Q9 = 2N3055 NPN power

3)
http://www.voxshowroom.com/northcoast/referring/transistors.htm
New Old Stock Replacement Transistors

[nickb]

I think the "+4.2V" on the base of Q8 is a typo. It should be 0.42V.

Unless you are absolutely determined to go 100% authentic I would swap out the AC187 for a silicon type. You'll need to adjust the bias a little. Which one is it?

[vintagekiki]

It should be 0.42V.

[The Dude]

Digikey says there are 53 of these in stock. They should be a direct cross.

https://www.digikey.com/en/products/...SABEgLfePD_BwE

[bsco]

Digikey says there are 53 of these in stock. They should be a direct cross.

https://www.digikey.com/en/products/...SABEgLfePD_BwE

Just checked the link....keep getting an error...will try to access digi key directly....Thanks for the tip...

[bsco]

I think the "+4.2V" on the base of Q8 is a typo. It should be 0.42V.

Unless you are absolutely determined to go 100% authentic I would swap out the AC187 for a silicon type. You'll need to adjust the bias a little. Which one is it?

I was thinking I would have to do that....I will do some more research and see if I can find a schematic.......
Cheers

[vintagekiki]

Do you think about upload photo of your bass combo?

[bsco]

Do you think about upload photo of your bass combo?

I will get a couple of pics and put them here....At present I am having some issues with my van...should have it taken care by lunch hour if everything goes well.....once I get over to the shop I will get some pics for you and post them this evening.....
Cheers

[vintagekiki]

Late 60s - 70s Vox solid state bass combo is Vox Kensington Bass and Essex Bass.
Vox Sovereign and Westminster is bass amp head.

http://www.voxshowroom.com/us/amp/index.html

[bsco]

Late 60s - 70s Vox solid state bass combo is Vox Kensington Bass and Essex Bass.
Vox Sovereign and Westminster is bass amp head.

http://www.voxshowroom.com/us/amp/index.html

The Vox over to the shop is a one piece combo and labeled Westminister.....I'll get a couple of pics for you.....