Hello.
I have a working EICO HF-20 tube integrated amplifier. Its in great shape, and sounds real good! I have all the original paperwork (manual, schematics, templates, etc...).
"Real" tube amps are very, very expensive as are tube amp kits. I am hoping to convert/rework the #20 into a guitar amp. PHONO 1 is set up for magnetic cartidge type input, so I think converting a #20 is feasible as per “Converting Integrated/PA Tube Amps into Guitar Amps” by Joe Jasniewski (http://www.rru.com/~meo/Guitar/Amps/PA2Guitar/index.html)a
I've attached the #20 schematic. I can email a better quality file, but cannot post due to attach file size limitations. I can also provide any other original documentation if necessary. Can someone please offer specific instructions for how to re-wire the input and tone 'grids'? As per Mr. Jasniewski this is all that is necessary. Future more complex mods are possible, but to begin I want to take one step at a time.
I had some exposure to electric circuits in college (building rectifier bridges, learning to use an oscilliscope, etc...). I think I can safely rework this with a little help.
Thank you
I have a working EICO HF-20 tube integrated amplifier. Its in great shape, and sounds real good! I have all the original paperwork (manual, schematics, templates, etc...).
"Real" tube amps are very, very expensive as are tube amp kits. I am hoping to convert/rework the #20 into a guitar amp. PHONO 1 is set up for magnetic cartidge type input, so I think converting a #20 is feasible as per “Converting Integrated/PA Tube Amps into Guitar Amps” by Joe Jasniewski (http://www.rru.com/~meo/Guitar/Amps/PA2Guitar/index.html)a
I've attached the #20 schematic. I can email a better quality file, but cannot post due to attach file size limitations. I can also provide any other original documentation if necessary. Can someone please offer specific instructions for how to re-wire the input and tone 'grids'? As per Mr. Jasniewski this is all that is necessary. Future more complex mods are possible, but to begin I want to take one step at a time.
I had some exposure to electric circuits in college (building rectifier bridges, learning to use an oscilliscope, etc...). I think I can safely rework this with a little help.
Thank you
Attachments
I suggest you sell it and use the proceeds to buy and modify a PA amp (you could buy SEVERAL Bogens, S-Cs, etc. for what the HF-20 will bring...). They're actually better suited to the purpose anyway.
Please listen to Tom's advice. The Eico is not the amp you want to convert to a guitar amp.
Not sure what kind of amp you want (Champ clone, Showman clone) but if you want to build a guitar amp, post what you want and someone can help.
I've built several different guitar amps (Champ from parts, Deluxe from a broken Knight, Princeton from a old tube record player, ...).
The Eico is not a guitar amp.
Listen to Tom.
Not sure what kind of amp you want (Champ clone, Showman clone) but if you want to build a guitar amp, post what you want and someone can help.
I've built several different guitar amps (Champ from parts, Deluxe from a broken Knight, Princeton from a old tube record player, ...).
The Eico is not a guitar amp.
Listen to Tom.
Thanks for the advice! I though all you needed to get a good conversion were enough gain stages as in magnetic phono input.
You are right. I also thought about selling the whole lot on ebay. I also have the original tuner, and a basket full of replacment valves. Maybe worth $400-$500 altogether?
Then, I could instead get a ready made amp kit to satisfy my curiosity. I may also wind up with a much better result.
However, tube amp kits are NOT cheap, and at least half a dozen internet sites are selling all different kinds. Any advice recommendations regarding this alternative?
Thanks again! Have a great weekend!
You are right. I also thought about selling the whole lot on ebay. I also have the original tuner, and a basket full of replacment valves. Maybe worth $400-$500 altogether?
Then, I could instead get a ready made amp kit to satisfy my curiosity. I may also wind up with a much better result.
However, tube amp kits are NOT cheap, and at least half a dozen internet sites are selling all different kinds. Any advice recommendations regarding this alternative?
Thanks again! Have a great weekend!
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