New tube amp.

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Project by CiscoKid posted 10-16-2012 12:36 PM 1900 views 4 times favorited 9 comments Add to Favorites Watch

Here’s another tube amp I recently completed. 1952 Fender Deluxe circuit. This is the 5C3 Deluxe that used octal preamp tubes with grid leak bias. I believe this is the last time Fender used the grid leak bias first gain stage. Grid current leaks out through the input circuit causing a negative voltage to appear on the grid, thus biasing the tube. A capacitor and large value resistor (5 meg) are used to keep the negative voltage fairly stable. All Fender Deluxes after this model used 12AX( or Y)7 preamp tubes. Cabinet is ribbon mahogany (sapele) and ebony. Through dovetails. 12” Tone Tubby completes the picture. This amp breaks up early and at relatively low volumes making it ideal for a practice amp. 5 or 6 on the volume dial gets you Billy Gibbons tones (think Mescalero CD) and 9 or 10 on the dial gets you squarly into Neil Young Rush Never Sleeps territory. This is using guitar – cable – amp with no pedals.

-- Al, Culpeper VA

9 comments so far

View WoodWorkWarrior's profile


46 posts in 2216 days

#1 posted 10-16-2012 12:49 PM

That rocks…literally! Cool idea to rebox an old amp. Nice display of the electronics as well.

-- Jason

View Monte Pittman's profile

Monte Pittman

29869 posts in 2481 days

#2 posted 10-16-2012 12:50 PM

Nice looking amp. Doesn’t exactly look like Billy Gibbons guitar though :-)

-- Nature created it, I just assemble it.

View CiscoKid's profile


343 posts in 3016 days

#3 posted 10-16-2012 01:16 PM

Thanks, but it is not an old amp – just an old circuit. I soldered up that puppy over the winter. Every capacitor and resistor. Point to point hand wiring just like the originals and I even use cloth covered wire for verisimilitude. Billy Gibbons has a lot of custom Gretsch guitars, Monte, including his own line of Billy-Bo models. While I own two pro-line Gretsches, I also have a couple of Guild X-500s, an American made Strat, an American made swamp ash Tele, and a Les Paul.

-- Al, Culpeper VA

View rmoore's profile


325 posts in 2778 days

#4 posted 10-16-2012 01:43 PM

Sweet build. Any chance of a video of you playing on it?

-- The more I learn, the more I realize I don't know. Ron, Crossville Tn

View carguy460's profile


807 posts in 2478 days

#5 posted 10-16-2012 02:39 PM

Great work! And nice guitar!

-- Jason K

View YorkshireStewart's profile


1130 posts in 4044 days

#6 posted 10-16-2012 05:05 PM

My oh my; what care you took with the layout of the electronickery! Just exquisite. Woodwork’s not bad either!!

-- Res severa verum gaudium - True pleasure is a serious business.

View MiniMoose's profile


27 posts in 2231 days

#7 posted 10-17-2012 01:29 AM

Nice! Sprague caps and all. Deeee-luxe. My amp is a hybrid 5e3/JTM45, but I almost never use the JTM45 side. Didn’t build it myself though. Bit over my skill level at this point. Maybe someday. Anyhow I love ptp tube amps like nothing else. Paired mine with a new Celestion G12H30. Man those speakers are awesome, highly recommend them. Apparently the old Celestion factory in Ipswitch changed back to the old adhesives that they used way back when and the speakers sound GREAT again. Time was that I wouldn’t touch a Celestion with a 10 foot pole, not so anymore.

Anyhow, awesome build and it looks sweet. I’d love to hear it, that’s for sure. Not sure how the mahogany would affect the tone. If it’s anything like I imagine, it might tame some of the typical Fender brightness. Got a good mic? You should post a demo video :)

-- Squeek!

View solardave's profile


75 posts in 2187 days

#8 posted 11-01-2012 08:05 PM

That’s a beauty. I’ve been wanting to build one just like that, with the octals. Nice job.

View PurpLev's profile


8540 posts in 3791 days

#9 posted 11-01-2012 08:09 PM


-- ㊍ When in doubt - There is no doubt - Go the safer route.

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