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Old 28th September 2010, 07:18 PM   #3021
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Sander'Z View Post
Inside view.
Interesting layout.

Thank's for the photo!
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Old 28th September 2010, 07:21 PM   #3022
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Interesting layout.
Real point-to-point...
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Old 28th September 2010, 07:43 PM   #3023
djn is offline djn  United States
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Geez Head, you find the coolest tubes.

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Originally Posted by head1962 View Post
Hi guys,
need help! found a bunch of these beautiful HUGE Telefunken RS329g transmitting triodes.
Anyone got a data sheet? These MUST be used in a big AMP.
thanks for any help!!! (the foto on the right is not right ;-))
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Old 28th September 2010, 07:46 PM   #3024
djn is offline djn  United States
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Utopia, can you tell us more about your GM70? I will have mine done in a couple weeks. I am running a two stage at 850v B+ driving the GM70 with a 12HL7 with a CCS on the HL7. Here is a pix so far. Also, what are you doing for the filliment PS?


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Originally Posted by utopia View Post
Hi
This is one of my amps:

Gm70

6sn7=>6h30=>300b=>gm70


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Old 29th September 2010, 04:55 PM   #3025
utopia is offline utopia  Poland
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Quote:
Originally Posted by djn View Post
Utopia, can you tell us more about your GM70? I will have mine done in a couple weeks. I am running a two stage at 850v B+ driving the GM70 with a 12HL7 with a CCS on the HL7. Here is a pix so far. Also, what are you doing for the filliment PS?

More on the Polish forum

Wzmacniacz na GM70 - Audiostereo.pl


Schematic

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Old 2nd October 2010, 10:40 PM   #3026
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I still need to change out the plate leads for something better looking, but here is a quad 832 parallel push-pull amp running in UL mode. The driver is a 6SL7 direct coupled to a 6SN7 concertina phase splitter.
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File Type: jpg 832-2.jpg (138.1 KB, 533 views)
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Last edited by torrence; 2nd October 2010 at 10:45 PM. Reason: Screwed up images the first time
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Old 5th October 2010, 10:06 PM   #3027
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I've seen so many of other folk's projects on this forum, so I figured I'd get in on the action, too. Pictured here is yet another RH84. Since I happened to have a pair of Hammond 125ESE's lying about, I breadboarded the circuit just to see what all the fuss was about - and it sounded incredible! Good enough, in fact, for me to spend some serious coin on the pair of nice James 6112HS OPT's for the final build.

The PT is a Hammond 270HX (275-0-275, 200 mA); the filter choke is a Hammond 193H (5H @200 mA). The end bells were stripped of the old finish and painted with a satin black heat-resistant paint. I wound up using a 5V4 rectifier instead of a 5U4 to shave 1A off the filament current and provide a "soft start". The meters monitor both power supply voltage and current, and were purchased from Weber Kits (yes, I know the meters aren't registering in the photo - the amp had been switched on just before snapping the shutter).

I constructed the chassis frame of Brazilian Cherry (Hymenaea courbaril). The corner columns were turned from curly maple and regular (American) cherry. All woodwork was given a coat of sanding sealer, sanded smooth, and finished with three coats of spray lacquer. The aluminum deck was lightly sanded and given several coats of hammer-finish paint. The light spots on the paintwork aren't chipped paint, BTW; they're just reflections from the lights I used.

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Old 5th October 2010, 10:15 PM   #3028
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Excellent build.
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Old 11th October 2010, 12:37 PM   #3029
Cassiel is offline Cassiel  Libya
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I'll give the amp a 9. Towel gets a 6.
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Old 14th October 2010, 09:07 PM   #3030
tomchr is offline tomchr  United States
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Love the camera, tripod reflection in the getter flash of the rectifier tube...

Very nice build though.
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