Sound City B100 Mk3 manufacture year verification

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Sound City B100 Mk3 manufacture year verification

Postby Jere on Wed Feb 22, 2017 10:54 am

Hello everyone, brand new member and Sound City owner here. Just bought a B100 Mk3 and it's awesome! Nice and mellow when played on quieter volume and head-blowing when turning volume up, just the way I like it
:cheers:

The previous owner said that the amp is from 1969-1970 and basically I have no reason to believe it's not, but just to be sure, how can I verify the year of manufacture? I've read that Mark 3 was build around ´69-70 but that's about it, does Sound City have some sort of system to check the manufacturing year by serial number? Mine is M3911 (Let me know if the link doesn't work)

Thank you!
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Re: Sound City B100 Mk3 manufacture year verification

Postby sound city 69 on Fri Feb 24, 2017 5:08 pm

Congratulations on your new amp! 1968 to early 1970 is the generally accepted time period for the Mark 3 to have been built.
The earlier heads have a centered logo which is black with silver lettering applied and no extra power tube holes.
The later heads have an aluminum logo with black lettering mounted on the right and two empty power tube holes.
The best way to place a date on your head is to find an original internal component with a date on it. It would have been made after that date.
Unfortunately there is no list of serial numbers that will help. I've tried to encourage others here to start one as I don't have the skills to do so but nothing has been done so far.
Check out the soundcitysite for lots of info.
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Re: Sound City B100 Mk3 manufacture year verification

Postby sound city 69 on Fri Feb 24, 2017 5:13 pm

I started my post before checking your link. If the logo is original. I'd say it is from the end of the Mark 3 era.
The embossed plastic logo was used on the Mark 4 series.
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Re: Sound City B100 Mk3 manufacture year verification

Postby sintech on Sat Sep 02, 2017 6:07 pm

Here’s my MK3 B100, serial 3744, so 167 amps apart.

Silver with Black lettering Logo.

This has a capacitor with date code of Dec 1969, so I’m assuming this is early 1970.

What date did MK4 production start?

http://i44.photobucket.com/albums/f23/s ... nzz9x9.jpg

http://i44.photobucket.com/albums/f23/s ... yjvkbb.jpg
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Re: Sound City B100 Mk3 manufacture year verification

Postby sound city 69 on Mon Sep 25, 2017 6:31 am

What date did MK4 production start?


It is generally accepted that the Mark 4 started in 1970.
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