Our Guitar Amp Project

PB2 · 14th June 2006, 04:55 AM

Our guitar amp project:
http://members.aol.com/miscpubacnt/TWIN-POWER-AMP.html

In case anyone is curious.

Pete B.

Wynand · 14th June 2006, 06:42 AM

It looks good sofar.... more inspiration!

runebivrin · 14th June 2006, 09:07 AM

I agree, it's a shame covering it with Tolex. It looks really well built.

I wish the guitar amp manufacturers had a little more imagination with regard to looks. I know for sure a guitar amp has close to nil WAF.

Rune

PB2 · 15th June 2006, 02:12 AM

Thanks for looking, take care!

amperex · 15th June 2006, 01:50 PM

A clone is fun way to save money & new parts make for an amp that should play for many years.

maxwedge · 24th June 2006, 05:39 PM

Lookin good and a great learning experience for your son.

I built a Twin clone myself that isn't quite the norm.
You can see it here and here.

I put 2 output trannys on mine as well but not for the same reasons as you. They don't run at the same time and I have them switched for different tube combos and types.

I don't really think you need anything other than a pair of 12's for a twin and mine has great bottom end and the top end sparkles. Just pick the right speakers.

PB2 · 25th June 2006, 03:05 PM

Thanks for looking amperex and Maxwedge!

We've been reading about and listening to a lot of amps and it seems he's looking more for a Marshall type sound. We'll probably close up the speaker box and might end up with Celestion speakers to get the tone he's looking for.

We both brought up Mesa-Boogie recently and I'll take a close look at those amps as we get further into it. They seem to offer flexibility, SS/tube rect, EL34 or 6L6, many overdrive options, etc. The tone stack and reverb look very much like Fender.

Nice job on your twin Maxwedge, very nice!

Pete B.

PB2 · 31st July 2006, 04:27 AM

Interesting that the lower cost Jensen C12Q looks better suited to an open back cabinet based on its Thiele and Small parameters:
http://www.vintagespeaker.com/search...inch%20speaker

Qts is 1.72 which on a relative basis will significantly boost the low end output at Fs = 84 Hz and help to compensate for the open baffle loss.

The more expensive, bigger magnet, C12N has a Q of .92 offering much less output at a slightly higher rolloff of Fs = 112 Hz.

The C12Q also has more Xmax = 1.5 mm as compared to the C12N Xmax = 1.0. The efficiency is significantly lower for the C12Q and it would make sense to use four of them to gain efficiency, power handling, and volume displacement in open back cabinets.

So these Jensens are by Recoton made in Italy, don't know how they compare to the originals. Anyone care to comment on reliability?

We're probably going to move to a closed or vented design anyway so the above consideration does not apply.

Seems the Alnico Celestion Blue is highly regarded, but the Weber copy also does well at half the price:
http://www.webervst.com/bt9908.htm

Anyone tried the Weber, or the Jensens?

quasi · 6th August 2006, 12:10 PM

Yiasou papou. Oreo, poli oreo.

PB2 · 22nd August 2006, 12:12 AM

Quote:

Originally posted by quasi
Yiasou papou. Oreo, poli oreo.

Papou says the same to you, yiasou!

Thanks for the oreo comment, never saw it spelled like that, lol!

Pete B.

14th June 2006, 04:55 AM	#1
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Our Guitar Amp Project Our guitar amp project: http://members.aol.com/miscpubacnt/TWIN-POWER-AMP.html In case anyone is curious. Pete B.

14th June 2006, 09:07 AM	#3
runebivrin diyAudio Member Join Date: Jul 2003 Location: Huddinge, Sweden	I agree, it's a shame covering it with Tolex. It looks really well built. I wish the guitar amp manufacturers had a little more imagination with regard to looks. I know for sure a guitar amp has close to nil WAF. Rune __________________ Do wizards use spell checkers?

15th June 2006, 01:50 PM	#5
amperex diyAudio Member Join Date: Feb 2005 Location: MI	Nice project A clone is fun way to save money & new parts make for an amp that should play for many years.

6th August 2006, 12:10 PM	#9
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	Yiasou papou. Oreo, poli oreo. __________________ http://sites.google.com/site/quasisdiyaudiosite/

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14th June 2006, 06:42 AM	#2
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	It looks good sofar.... more inspiration!

15th June 2006, 02:12 AM	#4
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Thanks for looking, take care!

24th June 2006, 05:39 PM	#6
maxwedge diyAudio Member Join Date: Jan 2004 Location: CA	Lookin good and a great learning experience for your son. I built a Twin clone myself that isn't quite the norm. You can see it here and here. I put 2 output trannys on mine as well but not for the same reasons as you. They don't run at the same time and I have them switched for different tube combos and types. I don't really think you need anything other than a pair of 12's for a twin and mine has great bottom end and the top end sparkles. Just pick the right speakers.

25th June 2006, 03:05 PM	#7
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Thanks for looking amperex and Maxwedge! We've been reading about and listening to a lot of amps and it seems he's looking more for a Marshall type sound. We'll probably close up the speaker box and might end up with Celestion speakers to get the tone he's looking for. We both brought up Mesa-Boogie recently and I'll take a close look at those amps as we get further into it. They seem to offer flexibility, SS/tube rect, EL34 or 6L6, many overdrive options, etc. The tone stack and reverb look very much like Fender. Nice job on your twin Maxwedge, very nice! Pete B.

31st July 2006, 04:27 AM	#8
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Interesting that the lower cost Jensen C12Q looks better suited to an open back cabinet based on its Thiele and Small parameters: http://www.vintagespeaker.com/search...inch%20speaker Qts is 1.72 which on a relative basis will significantly boost the low end output at Fs = 84 Hz and help to compensate for the open baffle loss. The more expensive, bigger magnet, C12N has a Q of .92 offering much less output at a slightly higher rolloff of Fs = 112 Hz. The C12Q also has more Xmax = 1.5 mm as compared to the C12N Xmax = 1.0. The efficiency is significantly lower for the C12Q and it would make sense to use four of them to gain efficiency, power handling, and volume displacement in open back cabinets. So these Jensens are by Recoton made in Italy, don't know how they compare to the originals. Anyone care to comment on reliability? We're probably going to move to a closed or vented design anyway so the above consideration does not apply. Seems the Alnico Celestion Blue is highly regarded, but the Weber copy also does well at half the price: http://www.webervst.com/bt9908.htm Anyone tried the Weber, or the Jensens?

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