Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: bnwitt on November 30, 2019, 12:06:17 pm

Title: Red-Nek Circuity PortaBuzz B-15
Post by: bnwitt on November 30, 2019, 12:06:17 pm

Hello Everyone.  Happy long weekend!  I'm wondering if anyone in here has heard of the PortaBuzz B-15 circuit layout by Red-Nek Circuity and where I can find files of it.  I'm working on this Ampeg preamp with the 12AX7 and 6SL7 separate circuits and even though that amp has a power section and this one doesn't it looks like a good reference for what I am doing.  Anyone heard of it?


Barry

Title: Re: Red-Nek Circuity PortaBuzz B-15
Post by: echuta13 on November 30, 2019, 12:45:29 pm

Maybe this?  https://www.tdpri.com/threads/ampeg-b-15-planning-stages.599479/

Title: Re: Red-Nek Circuity PortaBuzz B-15
Post by: bnwitt on November 30, 2019, 02:08:27 pm

Awesome!  Thanks echuta13.  I do believe this is the amp the previous builder was emulating with his preamp design.  The one difference is that he was using a 6SL7 and a 12AX7 tube.  This is supposed to be a 1960s and a 1970s style Ampeg preamp blended by separate volume controls into one preamp unit.  I need to figure out how to dump the entire power tube section and deliver the output to a balanced output.  Also the previous assembly is using a headphone amplifier and a balanced level output. 


The previous unit was using a DIY HC1 high current headphone amp board for the headphone output:


https://www.diyrecordingequipment.com/collections/all-products/products/hc1 (https://www.diyrecordingequipment.com/collections/all-products/products/hc1)


And for the balanced out he had the DIY balanced output board:


https://www.diyrecordingequipment.com/collections/all-products/products/balanced-output (https://www.diyrecordingequipment.com/collections/all-products/products/balanced-output)


There was what appears to be a homemade regulated 9 volt power supply but I'll probably want to install a more commercial unit.


I'll use the aforementioned units in this build since I already have them.  I've attached the hand drawn layout in PDF done by the previous builder.  Also below is the link to the build thread with the layout by BuzzKing:

https://www.tdpri.com/threads/ampeg-b-15-build-thread.610826/#post-6809982 (https://www.tdpri.com/threads/ampeg-b-15-build-thread.610826/#post-6809982)

Title: Re: Red-Nek Circuity PortaBuzz B-15
Post by: echuta13 on November 30, 2019, 06:43:33 pm

Good luck on the project and keep us updated!  I don't post much but I've lurked for quite awhile, and I always enjoy your amp stuff bnwitt!   :icon_biggrin:

Title: Re: Red-Nek Circuity PortaBuzz B-15
Post by: RWood on December 04, 2019, 01:38:52 pm

Did someone say Ampeg Buzz? ? ?