Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: stingray_65 on January 09, 2015, 02:00:40 pm

Title: Hoffman Stout Reverb questions
Post by: stingray_65 on January 09, 2015, 02:00:40 pm

Greetings friends,


I've begun gathering parts for a Stout reverb.


This build is for a good friend who IMHO really deserves to have a decent amp. Problem is, he is such a dedicated family man, he would never spend the money for one on himself.


So with those financial constraints, I've got to build this amp with as many parts I have on hand without compromising on sound quality or reliability.


My first question concerns the power supply section.


I have in my possession a transformer from an old RCA console record player.


It was a mono and supplied a 5U4GB recto  2 12AX7's and a pair of 6BQ5's


It has a bias tap at about 100V, and a separate 60v winding besides the usual 5v and 6v windings.


The secondaries read 301-0-301 unloaded.


Physically it has the same foot print as a Marshall 18W thru chassis transformer, but it seems maybe a 1/2" thinner in the core.


My concern is it may not support the  extra 12AX7 and 12AT7 that a stout reverb requires (heater wise)


The 6v winding landed on a socket that supplied the rest of the console lights and what ever else.


Is there a way to simulate the power draw on the heaters?


Am I making mountains out of molehills?


Thank you for any advise any may have


Ray

Title: Re: Hoffman Stout Reverb questions
Post by: Willabe on January 09, 2015, 06:03:39 pm

Here's a link for Doug's Stout reverb with new schemo and layout drawings (Visio) plus a BOM. (It's in his tube amp library of information along with a lot of other builds.) Extremely well documented.   :icon_biggrin:

http://el34world.com/schematics.htm#Hoffman_Stout_Reverb_ (http://el34world.com/schematics.htm#Hoffman_Stout_Reverb_)


         
                             Brad     :icon_biggrin:

Title: Re: Hoffman Stout Reverb questions
Post by: Willabe on January 09, 2015, 06:17:14 pm

 :hijack1:

Here's a few builds Sluckey did while you were away, you gotta see these!     :blob8:

All extremely well document with pictures/schemos/layout's/chassis temps drill guide/turret board drill guide/mods, the works!

And there's a thread he started for each build here.

http://home.comcast.net/~seluckey/amps/VAC15/ac15.htm (http://home.comcast.net/~seluckey/amps/VAC15/ac15.htm)

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

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

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

(Oh, and watch out for 2 newer guys, Ed Chambly and Silvergun.   :l3:)


                      Brad     :icon_biggrin: