Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Misc Schematics and Layouts => Topic started by: zapped on November 19, 2014, 12:23:46 pm

Title: All octal layout ?
Post by: zapped on November 19, 2014, 12:23:46 pm

Looking for a layout/schematic for an all octal project. Converting a 2x6V6 pa amp. I have space for the Rect. + power tubes + 3 preamp tubes. I'd like to add tremolo if space provides. Present preamp is 1 6sl7 and 1 6sj7 and I have room on face for 4 pots. Thanks for any help.   Ed
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Title: Re: All octal layout ?
Post by: sluckey on November 19, 2014, 02:09:25 pm

Ampeg has several all octal amps. Link to schematics is at the bottom of this page. Here's one that I did a while back. Maybe this can help...

     http://home.comcast.net/~seluckey/amps/RCA/RCA.htm (http://home.comcast.net/~seluckey/amps/RCA/RCA.htm)
 

Title: Re: All octal layout ?
Post by: zapped on November 20, 2014, 09:29:39 am

Thanks Steve. The j-12 and the m12 look similar to me at quick glance. Are there any major differences? Thanks for posting the schematics and layouts.. Also caps. used in the power supply are 20x450's? Would 16x 475's work ? I happen to have some left over from another project.. Thanks  Ed

Title: Re: All octal layout ?
Post by: DummyLoad on November 20, 2014, 11:26:11 am

a 5E3 spin with some mods - using all octals. 


http://el34world.com/Forum/index.php?topic=13382.msg125162#msg125162 (http://el34world.com/Forum/index.php?topic=13382.msg125162#msg125162)


--pete

Title: Re: All octal layout ?
Post by: zapped on November 21, 2014, 01:41:59 pm

Thanks DL. I don't have that much real estate to work with but I do like it. I wanted something like a 5c3 with Tremolo or Ampeg M12 w/6v6's using as much of the left overs on my bench as possible. However I do have very limited understanding of tube theory. I work from a chassis layout much better than a schematic..