Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Hoffman Turret and Eyelet Boards => Topic started by: EL34 on February 10, 2015, 10:38:51 am

Title: Hoffman Plexi 6V6
Post by: EL34 on February 10, 2015, 10:38:51 am

The layout Diagram, Schematic, BOM, Sound clips and build information can be found on the library page here
http://el34world.com/schematics.htm#Plexi_6V6_build (http://el34world.com/schematics.htm#Plexi_6V6_build)

Layout and Schematic
http://el34world.com/Hoffman/files/Hoffman_Plexi_6V6-V2.pdf (http://el34world.com/Hoffman/files/Hoffman_Plexi_6V6-V2.pdf)

BOM Parts list is here
http://el34world.com/Hoffman/files/Hoffman_Plexi6V6_BOM.pdf (http://el34world.com/Hoffman/files/Hoffman_Plexi6V6_BOM.pdf)

Hoffman Board install instructions (http://el34world.com/Hoffman/instructions.htm)

The build page is here
http://el34world.com/projects/Plexi6V6.htm (http://el34world.com/projects/Plexi6V6.htm)

Hoffman Turret Boards are on this page
http://hoffmanamps.com/MyStore/catalog/TurretBoard.htm (http://hoffmanamps.com/MyStore/catalog/TurretBoard.htm)

The parts list for this build is here
http://hoffmanamps.com/MyStore/catalog/PartsListIndex.htm (http://hoffmanamps.com/MyStore/catalog/PartsListIndex.htm)

Here's some sound clips of the Plexi 6V6 in action
Both clips are just the guitar plugged into the amp into a Marshall 4 x 12 cabinet with vintage 30 Celestions
Single coils used for chords and a humbucker used for the lead tones

http://el34world.com/Misc/Music/files/Plexi6V6Demo1.mp3 (http://el34world.com/Misc/Music/files/Plexi6V6Demo1.mp3)

http://el34world.com/Misc/Music/files/Plexi6V6Demo2.mp3 (http://el34world.com/Misc/Music/files/Plexi6V6Demo2.mp3)

http://el34world.com/Misc/Music/files/Plexi6V6Demo3.mp3 (http://el34world.com/Misc/Music/files/Plexi6V6Demo3.mp3)

http://el34world.com/Misc/Music/files/Plexi6V6Demo4.mp3 (http://el34world.com/Misc/Music/files/Plexi6V6Demo4.mp3)

Title: Re: Hoffman Plexi 6V6
Post by: EL34 on February 10, 2015, 10:54:40 am

Here's a picture of my Plexi 6V6
Lots more build pictures on this page


(http://el34world.com/projects/images/Img_9107_small.jpg)

Title: Re: Hoffman Plexi 6V6
Post by: EL34 on February 13, 2015, 09:29:45 am

I updated the PDF schematic with the voltages


I installed a face plate on my Plexi 6V6


Looking sharp now

Title: Re: Hoffman Plexi 6V6
Post by: EL34 on February 24, 2015, 04:33:58 pm

Thanks to Silvergun for making the cabinets in the pic below

Here's my Stout TMB and my Plexi 6V6

Title: Re: Hoffman Plexi 6V6
Post by: HighFlyingV on October 05, 2015, 09:23:33 pm

Quote from: EL34 on February 10, 2015, 10:38:51 am

The layout Diagram, Schematic, BOM, Sound clips and build information can be found on the library page here
http://el34world.com/schematics.htm#Plexi_6V6_build (http://el34world.com/schematics.htm#Plexi_6V6_build)

Layout and Schematic
http://el34world.com/Hoffman/files/Hoffman_Plexi_6V6-V2.pdf (http://el34world.com/Hoffman/files/Hoffman_Plexi_6V6-V2.pdf)

BOM Parts list is here
http://el34world.com/Hoffman/files/Hoffman_Plexi6V6_BOM.pdf (http://el34world.com/Hoffman/files/Hoffman_Plexi6V6_BOM.pdf)

Hoffman Board install instructions (http://el34world.com/Hoffman/instructions.htm)

The build page is here
http://el34world.com/projects/Plexi6V6.htm (http://el34world.com/projects/Plexi6V6.htm)

Hoffman Turret Boards are on this page
http://hoffmanamps.com/MyStore/catalog/TurretBoard.htm (http://hoffmanamps.com/MyStore/catalog/TurretBoard.htm)

The parts list for this build is here
http://hoffmanamps.com/MyStore/catalog/PartsListIndex.htm (http://hoffmanamps.com/MyStore/catalog/PartsListIndex.htm)

Here's some sound clips of the Plexi 6V6 in action
Both clips are just the guitar plugged into the amp into a Marshall 4 x 12 cabinet with vintage 30 Celestions
Single coils used for chords and a humbucker used for the lead tones

http://el34world.com/Misc/Music/files/Plexi6V6Demo1.mp3 (http://el34world.com/Misc/Music/files/Plexi6V6Demo1.mp3)

http://el34world.com/Misc/Music/files/Plexi6V6Demo2.mp3 (http://el34world.com/Misc/Music/files/Plexi6V6Demo2.mp3)

http://el34world.com/Misc/Music/files/Plexi6V6Demo3.mp3 (http://el34world.com/Misc/Music/files/Plexi6V6Demo3.mp3)

http://el34world.com/Misc/Music/files/Plexi6V6Demo4.mp3 (http://el34world.com/Misc/Music/files/Plexi6V6Demo4.mp3)

I like the tone and your "since I've Been Lovin you" instrumental , very cool EL34
I have read lots arguments about smaller amps even 18w not pulling off the plexi thing to well and I have no experience to make  that call.
I thought about trying to build a Bassman but the same argument was bought up in that a small wattage amp doesn't have the low punch and I know my previous JCM900 had punch but it was 100w 2x12.
At any rate I like that amp you built and your playing as well ! :guitar1

Title: Re: Hoffman Plexi 6V6
Post by: EL34 on October 06, 2015, 11:56:14 am

Thanks


A Bassman just does not have a good enough power supply like a Marshall does
They always seem flabby to me


The Plexi 6V6 has the better power supply like a big Marshall
That is, it does not share a filter cap between amp stages
It has better decoupling, etc than a sloppy old Fender power supply  :icon_biggrin:

Title: Re: Hoffman Plexi 6V6
Post by: HighFlyingV on October 07, 2015, 10:50:58 pm

I believe you there , your tone through the 4 x12 is real good . Rocks  :m7 :m7 :m7

Title: Re: Hoffman Plexi 6V6
Post by: Gainzilla on June 06, 2017, 04:37:06 pm

Hi Doug,


Couple questions about this board. Apologies if this isn't the right place to ask.


1) Is there any reason why I couldn't use this with a pair of EL84's?
2) If I order the board with turrets installed, would you be able to flip it? My current chassis has the input Jack on the far left.


Cheers!


- Bryce

Title: Re: Hoffman Plexi 6V6
Post by: sluckey on June 06, 2017, 04:55:09 pm

Quote

1) Is there any reason why I couldn't use this with a pair of EL84's?

No. Just need a simple change in the bias supply and maybe a couple resistors in the PI. Board layout would be the same.

Quote

2) If I order the board with turrets installed, would you be able to flip it? My current chassis has the input Jack on the far left.

Doug's amp already has the input on the far left. Take a look...

     http://el34world.com/projects/Plexi6V6.htm (http://el34world.com/projects/Plexi6V6.htm)

But if you still need to flip it end for end (like the attached pic) then just mount the turrets on the bottom of the board. Automatic flip.

Title: Re: Hoffman Plexi 6V6
Post by: EL34 on June 06, 2017, 05:47:00 pm

Looks like Steve beat me to it
Look at all the info on the library page

Title: Re: Hoffman Plexi 6V6
Post by: Gainzilla on June 06, 2017, 06:06:37 pm

Excellent, thanks for the confirmation Steve!


Regarding turrets mounted on the bottom of the board, that's exactly what I was asking (albeit indirectly). Doug, can you mount the turrets on the bottom side of the board if I order loaded with turrets?  :icon_biggrin:


Thanks again!


- Bryce

Title: Re: Hoffman Plexi 6V6
Post by: EL34 on June 06, 2017, 07:57:50 pm

Yes, I can do that
Just add a note to your order to mount turrets on bottom of board

Title: Re: Hoffman Plexi 6V6
Post by: Gainzilla on June 06, 2017, 08:14:09 pm

Thanks much!


- Bryce