SA212 1975 project

HIWATT amps from the Hylight Electronics era

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issmol
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SA212 1975 project

Post by issmol »

Hi guys,

Managed to acquire this yesterday.. Needs a bit of TLC. (understatement... :D )

Lots of questions coming probably regarding the missing pieces etc.

Loads of pics in the two links below.

http://s72.photobucket.com/user/philm0l/slideshow/combo

http://s72.photobucket.com/user/philm0l ... /combo%202

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mhuss
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Re: SA212 1975 project

Post by mhuss »

Nice score, albeit a bit abused(!). It's a shame about those valves.

The transformer looks a bit scary.

--mark
issmol
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Joined: Tue Nov 01, 2011 12:16 pm

Re: SA212 1975 project

Post by issmol »

Yes, its a great shame about the valves... But some you win and some you lose I suppose. :(

Its on the bench of my local tech at the moment to see how safe it actually is.... I would not have dreamt of switching it on.

(If the transformer looks scary to you Mark, can you imagine what it looked like to a complete novice like me. :shock: )
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OldSchoolDave
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Re: SA212 1975 project

Post by OldSchoolDave »

issmol wrote: Needs a bit of TLC. (understatement... :D )
But, definitely worthy of a restoration!

Keep us posted on your progress.

Dave
...Hey! I played that song when it was new...

http://www.OldSchoolDave.com
issmol
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Joined: Tue Nov 01, 2011 12:16 pm

Re: SA212 1975 project

Post by issmol »

Will do Dave. :-)

It's been stripped back to a bare shell at the moment. Drivers have been cleaned very gently and I have a small hole in one of them that needs a repair before I test them.

The whole cab including the grille cloth needs a good clean and some glue repair to the Tolex.

ie... Lots of cosmetic things I can do whilst I await my techs verdict..
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teethdream
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Re: SA212 1975 project

Post by teethdream »

Too bad about the tubes. This guys seen a few battles by the looks of it, totally screaming for a restoration. Hopefully your tech gives you a good verdict!
issmol
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Joined: Tue Nov 01, 2011 12:16 pm

Re: SA212 1975 project

Post by issmol »

Thanks teethdream.

The Tolex I can hopefully clean up without too much effort and I have some suggestions to help clean off the grille cloth but I could do with some advice regarding cleaning of the internal wiring and components please guys.

After many years of being in a smokey environment everything is caked in a yellow haze which I would like to remove if possible?
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mhuss
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Re: SA212 1975 project

Post by mhuss »

Don't you know that thick nicotine stains add the best tone? :twisted: :lol:

There no easy + safe way to clean the inside components. Maybe a toothbrush and a (very) little warm soapy water -- followed immediately by a thorough dry out.

--mark
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Dr.HI-TONE
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Re: SA212 1975 project

Post by Dr.HI-TONE »

good call Mark,
a toothbrush and a leaf blower to be safe.
I prefer not to use any liquid. That is mojo.....the amp earned it!
http://www.HI-TONE-Amps.com

HI-TONE, when only the best will do.

DR-F
issmol
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Re: SA212 1975 project

Post by issmol »

Ha! Ok... ok... I hear you both. I will leave the insides and the smokey tone well alone.. ;-)

In the great scheme of things I know this isn't important... but I would like to buy the correct replacement carry handle, two chicken head knobs, chassis securing bolts and a replacement rear lower panel.

Any pointers in that direction would be greatly appreciated please gents??
issmol
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Joined: Tue Nov 01, 2011 12:16 pm

Re: SA212 1975 project

Post by issmol »

Today = Heat shield cleaned. Valve cans cleaned. Purples loaded into WEM and plastic magnet cap reglued. Grille cloth steamed with a modified Black & Decker wall paper stripper. :lol:

Clean photos will be uploaded here.

http://s72.photobucket.com/user/philm0l ... /Combo%203
issmol
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Joined: Tue Nov 01, 2011 12:16 pm

Re: SA212 1975 project

Post by issmol »

Thought I would give you a quick update guys.

I received the amp back off my local tech over a week ago now and I have been playing it through a 2 x 12 WEM loaded with the Purple fanes. (damned nice it sounds too!)

Still lots to do in terms of recap etc but I thought you might like to see a mod that has now been snipped out by my tech....

Any ideas as to what it would have achieved?

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mhuss
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Re: SA212 1975 project

Post by mhuss »

The 1M5 resistor was originally 1M. I'm not sure why one would change that :?: unless the modder empirically determined that the change in voltage made for more clean headroom (or the opposite).

The caps across the Master Volume were put in to reduce brightness.

--mark
issmol
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Re: SA212 1975 project

Post by issmol »

mhuss wrote:The 1M5 resistor was originally 1M. I'm not sure why one would change that :?: unless the modder empirically determined that the change in voltage made for more clean headroom.
Thanks Mark, yes the 1M5 was added for more clean headroom as there was a distorted sine wave being produced with the 1M in place apparently.
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