Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: HexEnduction on September 07, 2026, 02:48:38 pm
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Hi there, first time long time! I've built about a dozen pedals in the past year and I'm really excited to be jumping into the amp world. I'm working off the 5F1 Mojotone kit and I just finished up adding all of the turret board components (still need to solder/add the offboard wiring). I checked over my work a few times but I'm paranoid that I'm missing something or that I messed something up... if anyone would be so kind, could you take a look and let me know if this looks alright? Open to any suggestions or potential improvements as well.
A couple of things to note: I moved the 16uf cap furthest left up a bit on the board as otherwise it would cover up the mounting hole (the hole isn't visible in the picture I snapped)... I didn't want to have the cap sitting on top of a screw. I also pushed that blue 10K cap at the bottom left upwards a tad so that I can more easily solder the turrets without inadvertently burning the resistor. I tested each component before installing them, everything is looking good on that end.
Wiring diagram:
(https://i.imgur.com/MpDjTfC.png)
My board:
(https://i.imgur.com/xGLChTf.jpeg)
Thanks so much!
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don't forget the jumper 'tween the 2 8uF's grounds
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don't forget the jumper 'tween the 2 8uF's grounds
Ah! I meant to go back and add the two jumpers at the top... I got so focused on double checking the components themselves that I completely overlooked them. I'll be adding them. I really appreciate it!
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I would prefer to see a flameproof resistor for the 22k power rail dropping resistor.
Also a little more space between the 500 ohm/5 watt cathode resistor and other components to prevent possible overheating.
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I would prefer to see a flameproof resistor for the 22k power rail dropping resistor.
Also a little more space between the 500 ohm/5 watt cathode resistor and other components to prevent possible overheating.
The 22k power rail dropping resistor is 1/2 watt but searching around for ones I can only find 1w 22k metal oxide resistors so far. Just to double check, using a 1 watt resistor here would be no problem right?
And I'll add some more space between those components.
Thanks a bunch for the suggestions.
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Hoffman sells 22K 3W metal oxide. However, according to the schematic there is 45V dropped across that 22K. So, the power dissipation is less than 0.1 watts. A 1/2W resistor will last forever.