Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Hoot on August 29, 2018, 09:57:32 am

Title: Looking for designs or help with or a combination of designs
Post by: Hoot on August 29, 2018, 09:57:32 am

This is kind of what I'm looking to build something that has gain, volume, treble, middle, bass, Reverb and presence. that can be switched from high power to a low power setting like 2/15 w. It could even have separate input jacks instead of having a switch if it would be easier to design that way. Have a tube rectifier with 12ax7 preamp circuits and el84 / 34 Power section. and since We're Dreaming I would love to have a footswitch that would turn the Reverb on and off and another switch that would allow the gain to go from a very low setting like a clean to whatever the knob is set at ( like 7 for example ). So that it would act like a clean / drive switch. Build a cabinet that would either have a 12 inch Jensen or celestion speaker.

Title: Re: Looking for designs or help with or a combination of designs
Post by: shooter on August 29, 2018, 10:28:42 am

start with a DR, build for 84/34, add this for attenuated power, walla, gigging with the cool kids

Title: Re: Looking for designs or help with or a combination of designs
Post by: Hoot on August 29, 2018, 11:54:00 am

Expound a little bit more on which kit I'm not familiar with what d r means

Title: Re: Looking for designs or help with or a combination of designs
Post by: shooter on August 29, 2018, 12:23:13 pm

deluxe reverb, Princeton reverb
google either, plus the word "kit"
make it work, THEN tweak it to your liking

here's Dougs link for the PR;
https://el34world.com/Hoffman/files/Hoffman_PrincetonReverb_NoTremolo.pdf

Title: Re: Looking for designs or help with or a combination of designs
Post by: Hoot on August 30, 2018, 04:17:33 pm

I think I found something that I want to build that meets my requirements however, it does not have a Reverb circuit. could I add this Reverb circuit out of the Princeton? if I can where would I tap into to send it to the circuit and recover it from the circuit. Also is there any little tweaks that someone would suggest that I make to the circuit. and I know this is going to sound extremely strange but I would like it to be less powerful, is it possible to just remove one of the output tubes from the circuit.

Title: Re: Looking for designs or help with or a combination of designs
Post by: VMS on August 31, 2018, 01:14:35 pm

I would probably try tubenit's 1-tube reverb after the channel switching relay.


https://el34world.com/Forum/index.php?topic=7957.0 (https://el34world.com/Forum/index.php?topic=7957.0)


and for lower power i would just use the master volume.

Title: Re: Looking for designs or help with or a combination of designs
Post by: dunner84 on September 11, 2018, 01:50:58 pm

Maybe take a look here: http://www.londonpower.com/all-kits#intro

High quality, and very helpful documentation. I suggest picking a preamp kit or two, reverb kit, and switching method, and design your own point to point style power amp. Also, big savings if you order just the hard parts, and source your own passive components... For lowering the power, you could play with turning tubes off, build in a switchable attenuator, or even add one of the vvr kits and put it on a switch.