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Old 15th January 2011, 09:05 AM   #3171
nicoch58 is offline nicoch58  Europe
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56oval you paid the plate with one leg ?!
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Old 15th January 2011, 11:26 PM   #3172
BoilermakerFan is offline BoilermakerFan  United States
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56oval, I think the pics of the finished amp need to be taken with it sitting on the driver's seat of the V-dub. :-)
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Old 18th January 2011, 04:04 AM   #3173
56oval is offline 56oval  Australia
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Quote:
Originally Posted by nicoch46 View Post
56oval you paid the plate with one leg ?!
It helped hide a few marks in the copper that would show up if I was to get it highly polished .

Quote:
Originally Posted by BoilermakerFan View Post
56oval, I think the pics of the finished amp need to be taken with it sitting on the driver's seat of the V-dub. :-)
I don't have the 56oval anymore ,I sold it to finance building a 4way active speaker running of set amps .

Cheers
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Old 19th January 2011, 04:54 PM   #3174
panos29 is offline panos29  Greece
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Forgive my ignorance, I would like to ask what exactly is "engine turned" I really like it, wow!
Quote:
Originally Posted by 56oval View Post
Hello
Sorry guys its not finished ,but here is the top of my 300B SET i'm building .
The copper plate is 5mm copper and I engine turned/jewelled the top plate it's given it a more 3D look .
Click the image to open in full size.

Cheers
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Old 20th January 2011, 11:44 AM   #3175
TonyTecson is offline TonyTecson  Philippines
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hi,

here are pictures of my latest preamp build, uses 7X6 rectifiers and 7N7 loctal tubes:

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 20th January 2011, 11:50 AM   #3176
Bas Horneman is offline Bas Horneman  Netherlands
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Hi Tony,

What are your impressions? Does it perform well? Do you have a schematic for it?

I still have a few 7n7's I want to try out one day.

Kind regards,
Bas
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Old 20th January 2011, 12:08 PM   #3177
TonyTecson is offline TonyTecson  Philippines
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Hi Bas,

the sound is very good indeed.......

i do not have the scheme yet, but the power supply delivers 300volts at 30mA, current consumption as follows, 10mA for the 300volt shunt zener string, 10mA each channel...

each channel has 5mA each for the input common cathode and cathode follower, i wired the 7N7 so that i can rotate the tubes so that roles are reversed when i swap them...

the 7X6 rectifier shared the same filament winding with the 7N7's, since is used dicrect coupling, i lifted the chathodes to about 90v using a resistive voltage devider.

the transformer secondary is 250volts and feed a hybrid rectifier formed by the 7X6 and a diode bridge...i built the transformer myself......

i use this pre-amp to drive a Sure T-amp that is set to low gain......

the preamp sounds wonderful to my ears.....and very quiet too....
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Last edited by TonyTecson; 20th January 2011 at 12:11 PM.
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Old 20th January 2011, 01:27 PM   #3178
Bas Horneman is offline Bas Horneman  Netherlands
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Quote:
the preamp sounds wonderful to my ears.....and very quiet too...
Good to hear....enjoy.
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Old 20th January 2011, 11:58 PM   #3179
kruesi is offline kruesi  United States
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Congratulations on a fine build with loctals! -One day I should try them; you're an inspiration!
I'd like to see a schematic- looks like LED bias- I'm curious what you did.
Having it be quiet counts for a LOT. Glad it worked out!
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Old 21st January 2011, 02:30 AM   #3180
56oval is offline 56oval  Australia
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Quote:
Originally Posted by panos29 View Post
Forgive my ignorance, I would like to ask what exactly is "engine turned" I really like it, wow!
Hi Pano
Heres a video and I used Cratek rubberized abrasive stick's 5/8th easy to use .I used a press drill much easier than trying to do it by hand .

YouTube - Sopwith Pup how to burnish engine turning finish in aluminum aircraft panels

Cheers
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