Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jjschessmaster on December 14, 2024, 07:46:54 pm
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Hey all! I have a question that might seem silly to anyone who has ever designed an amp. I've built a bunch of kits, followed some scratch built layouts, and have made benign mods (bright switches, depth mods, etc) but have not done much more than that.
I'm looking at building a tube town ac18 (just want to try out an ef86 ultimately). The kit is based on an 18 watt chassis so it has a spare preamp spot and a few inputs and controls open. I figured it would be relatively easy to toss in a parallel triode like the spitfire as a channel 2. I would like to run it parallel with individual inputs.
Where would I tie the signal path in? I've copied the link to the ac18 schematic and spitfire. I think I disconnect the ground off the phase inverter c9 and plug in there? Do I need to change c9 to 10nf?
Appreciate any help as I get my feet wet into more significant mods.
https://media.tubetown.net/cms/?DIY/18Plus/TT_AC18_-engl- (https://media.tubetown.net/cms/?DIY/18Plus/TT_AC18_-engl-)
https://media.tubetown.net/cms/?DIY/18Plus/TT_Spit_F (https://media.tubetown.net/cms/?DIY/18Plus/TT_Spit_F).
Edit; tried to fix Spit F. link, failed. :dontknow:
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This may give you some ideas...
https://sluckeyamps.com/dual_lite/dual_lite.htm