Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Hoffman Turret and Eyelet Boards => Topic started by: EL34 on July 29, 2014, 07:57:24 am
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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)
Layout and Schematic
http://el34world.com/Hoffman/files/Hoffman_5E3.pdf (http://el34world.com/Hoffman/files/Hoffman_5E3.pdf)
BOM - Parts list
http://el34world.com/Hoffman/files/Hoffman_5E3_BOM.pdf (http://el34world.com/Hoffman/files/Hoffman_5E3_BOM.pdf)
Hoffman Board install instructions (http://el34world.com/Hoffman/instructions.htm)
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)
(http://el34world.com/Hoffman/images/Hoffman_5E3_small2.gif)
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Hello Doug,
I am sorry to interrupt you again.
This is my first amp and my first soldering project at all, so please excuse me.
I bought your 5e3 kit and I am following your Fender 5e3 layout.
http://el34world.com/Hoffman/files/Hoffman_5E3.pdf (http://el34world.com/Hoffman/files/Hoffman_5E3.pdf)
Three questions regarding my order.
1) In the chassis there is room for 4 input jacks and I also received 4 inputs, but there are only 2 inputs on the layout and schematic?
2) I have received 4 68k resistors, but I don’t see them anywhere on the layout. Meanwhile, I am missing the 2 33k resistors between
the inputs and the first tube.
3) I have received a 5 watt 250 ohm wire wound resistor, but according to the layout I need a 10 watt 250 ohm - does this make a difference?
I would like to say that I am very happy about the delivery and I find your homepage and youtube videos.
Please look at all the documents under the 5E3 section on the library page here.
http://el34world.com/schematics.htm#Hoffman_5E3_Tweed_Deluxe_ (http://el34world.com/schematics.htm#Hoffman_5E3_Tweed_Deluxe_)
Including this one that is in the list of documents
http://el34world.com/Hoffman/files/CommonHookups.pdf (http://el34world.com/Hoffman/files/CommonHookups.pdf)
1) The schematic shows how to hook up 2 input jacks for each channel and the [parts you use for dual input jacks
http://el34world.com/Hoffman/files/Hoffman_5E3.pdf (http://el34world.com/Hoffman/files/Hoffman_5E3.pdf)
2) 68k resistor are used for dual input jacks
3) 5 watt 250 ohm resistor will be fine
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Notes about the Hoffman 5E3 turret board.
Some people have asked where is the 820 ohm cathode resistor for the first pre amp tube
Answered with a question: What happens when you split the cathode up and give each tube half it's own cathode resistor?
You now have half the cathode current on each cathode resistor and so you double the cathode resistor size for each cathode to get the same results as a single cathode resistor
You can now voice each half of the first pre amp tube differently if you want to by using different cathode bypass caps.