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  #1  
Old 29th November 2006, 03:41 PM
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Default Amp-from-a box-of-bits?

A few years back I stripped out the Xfmrs and Valve from a old Sonicator (a small amp that vibrates a probe at HF). They've lived in a box since then. The probe was corroded beyond use and written off, hence me going into Steptoe-mode over the osccilator/amp

Over lunch today I've had a look at the Xfmrs, all 3 of them. 1st is an autotransformer that steps down 240 to 120 Volts (ish) (it was a very old american bit of kit), 2nd is the mains Xfmr which has a 120 Volt primary, secondaries are 312-0-370Volts (?), 6.2V and 3.7-0-3.7. 3rd is the output Xfmr that drove the probe, this is a Stancor 12Watts, the primaries are labelled Com-500-1000-1500 and 2000, the secondaries are com-3.2-6.8 (presumably impedences?).

It had a 6L6GC as the output valve. I've saved both it and the Valve base. The amp/oscilator still worked, just the probe was US and unobtainable.

Do any of you think I could make a very basic low-powered audio amp out of the bits here? If so could anyone furnish me with a cct Diagram!!!

I haven't got anything to make at the mo untill the WD88VA arrives so I'm scratching around for a project using bits I've got here!

DTB
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Old 29th November 2006, 03:54 PM
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Default Re: Amp-from-a box-of-bits?

Leave it.......
Leave it....

Next you will be stripping the motor out the washing machine to make an idler or DD turntable......
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Old 29th November 2006, 03:57 PM
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Default Re: Amp-from-a box-of-bits?

Quote:
Originally Posted by BOONDI
Leave it.......
Leave it....

Next you will be stripping the motor out the washing machine to make an idler or DD turntable......


....must create...must build summink....soldering iron itching....can't concentrate....winter.....cold....no skateboarding...DTB goes potty.....aaarrrrrggghhhh!


DTB
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Old 29th November 2006, 04:33 PM
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Default Re: Amp-from-a box-of-bits?

Quote:
Originally Posted by BOONDI
Leave it.......
Leave it....

Next you will be stripping the motor out the washing machine to make an idler or DD turntable......
Now there's a thought. LG do a direct drive washing machine...
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Old 29th November 2006, 06:38 PM
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Default Re: Amp-from-a box-of-bits?

I have an idea for you.

Make this turntable.

hydraulic slate platter machined to fit into a sunken plinth with oil and graphite powder, the platter being the bearing, inductive drive.

Air bearing arm or Schroeder arm.

When you've finished that report back and I'll give you another project.

Or learn plumbing overnight and fit me a boiler at 17 Highfield Scarborough tomorrow while I go and attend to all the breakdowns.
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Old 29th November 2006, 09:24 PM
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Default Re: Amp-from-a box-of-bits?

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Originally Posted by Shane
Now there's a thought. LG do a direct drive washing machine...
Hope the LG is better than our Electrolux, its crap at washing records.

DTB
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Old 29th November 2006, 09:27 PM
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Default Re: Amp-from-a box-of-bits?

Quote:
Originally Posted by Paul Barker
I have an idea for you.

Make this turntable.

hydraulic slate platter machined to fit into a sunken plinth with oil and graphite powder, the platter being the bearing, inductive drive.

Air bearing arm or Schroeder arm.

When you've finished that report back and I'll give you another project.

Or learn plumbing overnight and fit me a boiler at 17 Highfield Scarborough tomorrow while I go and attend to all the breakdowns.
Bum!

I fitted the Boiler at number 18, doh! Sorry boss.

I made the TT during my coffee break, it looks uncannilly like a GL75 in a ply/trespa plinth though and the arm looks like a Decca U/P...

DTB
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Old 29th November 2006, 09:30 PM
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Default Re: Amp-from-a box-of-bits?

Forgot to add, I've been given a box of old Valves too by one of the sparky's that used to work at our place. Full of old Mullard and Pinnacle Valves. Only biggies though are a GEC KT88 and a 5Z4, theres a lot of PCF/PCL and EF/ECF types, surely I can make summat out of those with my sonicator Xfmr set

No more talk of washing machines, yer all daft

DTB
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Old 29th November 2006, 09:41 PM
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Default Re: Amp-from-a box-of-bits?

Hi Dave-they are a silly lot arn't they.

because i am unable to understand valve theory (i'm a DIV) i search the web for circuits,thats how i found the 832 circuit.

not saying you will find anything to use those parts but you never know !

There are several circuits i found using one twin ECL82 valve per channel,which is about as simple as you can get.If i was starting from scratch again that is what i would go for,but you would need sensitive speakers.

Philip
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Old 29th November 2006, 09:48 PM
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Default Re: Amp-from-a box-of-bits?

Quote:
Originally Posted by pre65
There are several circuits i found using one twin ECL82 valve per channel,which is about as simple as you can get.If i was starting from scratch again that is what i would go for,but you would need sensitive speakers.

Philip
Hmmmm...thats a good idea Philip, I'll have a search. Its doesn't have to be stereo, just an audio amp.

My speakers ARE sensitive, if I play music with any swearing in they blush

DTB
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