Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: dpm309 on June 11, 2012, 03:44:29 pm

Title: AC4tv Turret Board
Post by: dpm309 on June 11, 2012, 03:44:29 pm

Was wondering if anyone has ever swapped out the PCB in a Vox AC4tv with a turret board.  I have someone who wants their AC4tv modified with point to point wiring so my first thought was to use a turret board.  They also want the same circuit as the original AC4tv.  I have the schematic for the AC4tv but cannot find a schematic for the AC4hw1.  Did Vox use the same circuit for both of these?  Also, I cannot find any layout diagrams for the AC4 which would be my starting point for construction of a turret board.  Should I look at Champ layout for ideas?  Any other suggestions?

Thanks,

Dan

Title: Re: AC4tv Turret Board
Post by: kagliostro on June 11, 2012, 04:36:50 pm

Vox AC4

(http://i217.photobucket.com/albums/cc212/grog_album/Vox4.jpg)

(http://i217.photobucket.com/albums/cc212/grog_album/VoxAC4aa1.jpg)

K

Title: Re: AC4tv Turret Board
Post by: dpm309 on June 11, 2012, 08:56:53 pm

Kagliostro,

Thanks for the schematic and layout.  I did find out that the AC4TV and the AC4HW are different circuits.   The AC4hw has added the top boost as on the original AC4.  I will be able to use these layout examples to create a layout for the AC4TV.  For some reason, the owner wants to keep the circuit the same as he likes the sound he gets.  He is having other issues such as volume spiking and other unspecified issues after he had it repaired.  He was hoping a hand wired version would rectify these problems.

Dan

Title: Re: AC4tv Turret Board
Post by: Willabe on June 12, 2012, 01:15:31 am

Our good Italian friend K, is the man! He's always got something up his sleeve to share. 

Always helpful to all.     :wink:



                Brad      :icon_biggrin:


                      

Title: Re: AC4tv Turret Board
Post by: kagliostro on December 21, 2020, 08:10:22 am

Well, I know, this thread was stopped a long time ago .....

Here you can see some good pictures of the inside of a VOX AC4HW1

https://www.tdpri.com/threads/goodbye-ruby-tubes-day-ii-vox-ac4hw1-the-unboxening.639441/ (https://www.tdpri.com/threads/goodbye-ruby-tubes-day-ii-vox-ac4hw1-the-unboxening.639441/)

and here it is the VOX AC4HW1 schematic

(https://i.imgur.com/UpnHTq7.jpg)

Franco