Spare parts for SC100 Mark 3

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Spare parts for SC100 Mark 3

Postby jthibault on Sun May 25, 2014 11:51 pm

I'm wondering if anyone knows of a possible source for replacement parts for the Mark 3? I got my hands on one that is missing the back plate on the amp and would like to find an OG replacement. Here's a picture of the back:

Image
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Re: Spare parts for SC100 Mark 3

Postby Highwaystar on Mon May 26, 2014 6:18 pm

Nice, Are those 6CA7 tubes?
To help the search, a early Hiwatt is the same also
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Re: Spare parts for SC100 Mark 3

Postby Papa Dog on Mon May 26, 2014 7:35 pm

would you mind posting more pics?

or send them to admin@soundcitysite.com please.

jut finished moving, so it will be a while, but I may have one somewhere in my stash.
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Re: Spare parts for SC100 Mark 3

Postby Mr. Foxen on Mon May 26, 2014 7:40 pm

Highwaystar wrote:Nice, Are those 6CA7 tubes?
To help the search, a early Hiwatt is the same also


Think all Hiwatts were basketweave covered, and this one is the smoother stuff.
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Re: Spare parts for SC100 Mark 3

Postby jthibault on Tue May 27, 2014 6:04 am

Papa Dog wrote:would you mind posting more pics?

or send them to admin@soundcitysite.com please.

jut finished moving, so it will be a while, but I may have one somewhere in my stash.


Here are the photos I took yesterday:

Image
Image

I can take better photos next time I'm at the jam space if there's anything you need more detail on. Hopefully it gives you an idea of what the tolex is like anyway.
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Re: Spare parts for SC100 Mark 3

Postby jthibault on Tue May 27, 2014 6:18 am

Highwaystar wrote:Nice, Are those 6CA7 tubes?
To help the search, a early Hiwatt is the same also


The tubes are quite old RCAs, there is a stamp on the tubes that says 5881. I'd love some help finding out exactly what they are, here's a decent pic:

Image
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Re: Spare parts for SC100 Mark 3

Postby Mr. Foxen on Tue May 27, 2014 4:46 pm

Variant on 6L6, basically, not really right for the amp, might indicate modded inside.
New music: https://warriorpope.bandcamp.com/album/anchorite
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Re: Spare parts for SC100 Mark 3

Postby gldtp99 on Tue May 27, 2014 5:39 pm

Nice SC L100 Mk3---- it looks a lot like my black one (sitting under my Hiwatt DR504):

Image

These are rare amps----- finding spare parts is often a matter of luck------ you might not be able to match the tolex (Rexan ?)----- it probably isn't made anymore...................................gldtp99
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Re: Spare parts for SC100 Mark 3

Postby Highwaystar on Fri May 30, 2014 5:29 am

This covering is still used for book covers, I've found samples and repaired a front panel many years back.
Hiwatts before I think 69 used lot of the same parts, so up till around 68 should have this same covering.
One could take a picture to a wood shop and have them reproduce the rear cover core.

The 5881 is a low power 6L6 commonly known as a 6L6wxt, I use them in my early Bassman.
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Re: Spare parts for SC100 Mark 3

Postby Papa Dog on Fri May 30, 2014 6:10 am

I tyhink it is nice that you have a complete set of coloured knobs for that amp.
Those are getting difficult to source.

The 5881 is similar to the 6L6, but has a 20% higher plate and screen disipation.
Many early Fender schematics call for 5881s. I would reckon that the 6L6 is much more common and why Fender changed over.

Some (if not most) amps which run EL34s can also run 6L6s, and therefor 5881s. As I understand it little change would need be made to run one where the other is indicated. The main difference would be the overal amp tone. which one sounds better is purely subjective and personal.
Obviously someone in the past thought that they prefered the 5881s, but that amp would have come from the factory with EL34s. If you are wanting to put that amp back to spec or restore it then El34s are the way to go. If you are just wanting to have a good playing amp, and if it suites you as it is now and the tubes are good, then please post some clips so that we can hear a SC100 Mk3 with 5881s.
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Re: Spare parts for SC100 Mark 3

Postby Papa Dog on Fri May 30, 2014 6:19 am

Highwaystar wrote:This covering is still used for book covers, I've found samples and repaired a front panel many years back.
Hiwatts before I think 69 used lot of the same parts, so up till around 68 should have this same covering.
One could take a picture to a wood shop and have them reproduce the rear cover core.


Although the official relationship with Dave Reeves ended c. 1969 many Sound City amps had the same chassis and head cabs as HiWatt up until late 1972- early 1973. The schematics for the Mk3 are remarkably similar to some HiWatt amps, although there were a few models which were obviously different. In fact, the amps were so similar in parts, construction and design that sometimes the only way to tell them apart (when stripped of badges and other external indications) is lead dress and quality control, since that is where D/A did much of their corner cutting and cost "savings".
There Ain't No Such Thing As A Free Lunch.

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Of shoes--and ships--and sealing-wax--
Of cabbages--and kings--"
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Re: Spare parts for SC100 Mark 3

Postby Rex Everything on Mon Sep 15, 2014 10:53 pm

My SC L100 Mark 3 has the smooth covering as well. I need a badge for mine (and a faceplate...)
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