Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Hoffman Turret and Eyelet Boards => Topic started by: EL34 on July 31, 2014, 10:44:26 am

Title: Hoffman AB763 Turret Boards - a new model added
Post by: EL34 on July 31, 2014, 10:44:26 am

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


AB763 one channel Layout and Schematic
http://el34world.com/Hoffman/files/Hoffman_AB763_1.pdf (http://el34world.com/Hoffman/files/Hoffman_AB763_1.pdf)

AB763 one channel BOM - Parts list
http://el34world.com/Hoffman/files/Hoffman_AB763_1_BOM.pdf (http://el34world.com/Hoffman/files/Hoffman_AB763_1_BOM.pdf)

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

AB763 two channel Layout and Schematic
http://el34world.com/Hoffman/files/Hoffman_AB763_2.pdf (http://el34world.com/Hoffman/files/Hoffman_AB763_2.pdf)

AB763 two channel BOM - Parts list
http://el34world.com/Hoffman/files/Hoffman_AB763_2_BOM.pdf (http://el34world.com/Hoffman/files/Hoffman_AB763_2_BOM.pdf)

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

Hoffman amps Public parts list page is here
http://hoffmanamps.com/MyStore/catalog/PartsListIndex.htm (http://hoffmanamps.com/MyStore/catalog/PartsListIndex.htm)

Title: Re: Hoffman AB763 Turret Boards - a new model added
Post by: EL34 on May 22, 2018, 12:36:37 pm

I just added a new AB763 board called the AB763 short board
Sometimes one of my longer AB763 boards will not fit into a short chassis layout
I removed the right end of the regular AB763 board which made the short board about 3 inches shorter

These items were removed
The two 100 ohm heater CT reistsors
The bias circircuit
The screen grid resistors
The one ohm cathode resistors

You can use the separate bias board 1 and  that has the two 100 ohm resistors and the bias circuit
The screen grid resistors and one ohm resistors attach to the power tube sockets like on a vintage Fender

The link to all the AB763 turret boards on the library page is here
All the AB763 boards are contained in the same PDF files
http://el34world.com/schematics.htm#Hoffman_AB763_Two_Channel_ (http://el34world.com/schematics.htm#Hoffman_AB763_Two_Channel_)

Check out the links in the post above this one

Here's pic of the short board and the separate bias board

Title: Re: Hoffman AB763 Turret Boards - a new model added
Post by: EL34 on May 23, 2018, 06:04:08 am

Please look at all the documents for the boards before asking questions

I was asked these questions - This info is all listed in the documents

Quote

Can you use 6V6 power tubes with a AB763 board?

Quote

What size wires are used where?

Title: Re: Hoffman AB763 Turret Boards - a new model added
Post by: EL34 on January 02, 2019, 08:02:53 am

Lots of great AB763 info and mod info on Rob Robinette's page here
https://robrobinette.com/AB763_Modifications.htm