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PostPosted: 29 Aug 2018, 15:45 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi Everyone, I have a new project in the works....I don't want to spill the "beans" on it completely, but it is a hybrid and uses 6AS7s. I did attach a photo of the chassis as it now exists. Since some of the components are weeks away I have to let it rest for awhile. I expect to post a full build project on it as I figure it could interest a number of you diyers with spare vintage tubes lying around.

Good listening
Bruce
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6AS7 Project.jpg


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PostPosted: 29 Aug 2018, 19:32 
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Joined: 08 Aug 2009, 03:11
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Location: Chilliwack, BC
Always good to see a new innovation from you, Bruce! :thumbsup:

/me guessing an OTL headphone amp :D

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PostPosted: 30 Aug 2018, 16:34 
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Joined: 20 Feb 2014, 10:35
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Location: NZ
The 6AS7 is an octal base power triode. Nice chassis Bruce, but those look like 9-pin noval sockets??


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PostPosted: 30 Aug 2018, 17:13 
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My guess from looking at the chassis, is a 6AS7 Parallel / Push-Pull power amp with current source cathode biasing and 6SN7 SRPP driver.

So, Bruce... How much did I get right?

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PostPosted: 30 Aug 2018, 21:41 
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Hi, They are octals. Moderately close, but no "horseshoe". I did consider that though.

Good listening
Bruce

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PostPosted: 02 Sep 2018, 11:04 
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Hi everyone. Still waiting on parts...about 30 pounds of them 8-) Progress on the guts though.

Good listening
Bruce
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inside 2.jpg


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PostPosted: 02 Sep 2018, 14:38 
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Joined: 07 Jan 2018, 07:13
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Is that a choke on the back wall?


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PostPosted: 02 Sep 2018, 15:09 
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Hi, Nope. It is a 12VAC transformer.

Good listening
Bruce

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PostPosted: 02 Sep 2018, 18:50 
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How will this compare to your Oddblock Octals?

Thanks


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PostPosted: 02 Sep 2018, 20:41 
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Joined: 09 Oct 2012, 19:43
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Location: Vancouver Canada
Is that gnd lug on the back panel? Perhaps a phono gnd? Relay switched inputs, OPT holes in the chassis with pwr trans in the middle so not just a headphone amp. The spkr banana jacks on the back helped the guess. I'm agreeing with Matt. PP 6AS7 paralleled and 6SN7 in the front end. Hybrid = 12v trans driving SS front end with Vacuum tubes on the lid.


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