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Old 28th Mar 2017, 1:59 pm   #1
Herald1360
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Default A little project for the spring....

Found this in a bric-a-brac shop....

Tempted to add "Don't try this at home"
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File Type: pdf Gram Amp 1.pdf (247.2 KB, 291 views)
File Type: pdf Gram Amp 2.pdf (216.1 KB, 189 views)
File Type: pdf Gram Amp 3.pdf (218.0 KB, 165 views)
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Old 28th Mar 2017, 2:33 pm   #2
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Default Re: A little project for the spring....

Ooerr! Live chassis, very dodgy!

There was a very similar design in Practical Television, many years ago (but post 1966) that used a PL81 as the output pentode. It was called "The Teleamp".
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Old 28th Mar 2017, 2:41 pm   #3
Hartley118
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Default Re: A little project for the spring....

I see that the sign-off to the article is 'FGR'. I wonder whether that was the ubiquitous F G Rayer who entertained and informed so many of us with his designs published in Practical Wireless during the 1950s and 60s.

Martin
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Old 28th Mar 2017, 5:23 pm   #4
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Default Re: A little project for the spring....

Project for the winter, keeps the room warm!
 
Old 28th Mar 2017, 5:49 pm   #5
Herald1360
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Default Re: A little project for the spring....

Quote:
Originally Posted by dazzlevision View Post
Ooerr! Live chassis, very dodgy!

I guess making the chassis from wood was a nod to safety of sorts.
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Old 28th Mar 2017, 6:20 pm   #6
ukcol
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Default Re: A little project for the spring....

Regarding the live chassis.

As you are likely to be building from junk box components you could, provided you have a suitable transformer, use a 6V6 for the output valve and perhaps a 5v heater rectifier or silicon diodes. Then you would a nice boring isolated chassis.
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Old 28th Mar 2017, 6:33 pm   #7
Herald1360
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Default Re: A little project for the spring....

Nah. Use a heater dropper capacitor and hide an isolation amplifier for the input under the chassis!
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Old 28th Mar 2017, 10:59 pm   #8
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Default Re: A little project for the spring....

Still in business so your dependants can always sue!

http://www.alwayshobbies.com/
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Old 29th Mar 2017, 7:47 am   #9
ukcol
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Nah....
This man knows his own mind.
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