TweedMaster non-HRM

[stelligan]

stelligan,

You want a little more hair on it........play with some high plate values on V1 and 2.

My Bassman 70 convert never really gets that ultra clean. But clean enough for me.....with more than ample grind when you push it.
Love the OD this way too.

Thanks gd57. I have a 50 watter on my bench right now that will incorporate this...

[Structo]

I have the high plate resistors on my 100w ODS and it is not Hi Fi clean in the clean channel.
I can dial it that way but I prefer it just a bit low Fi. [/u]

[renshen1957]

If someone wants an editable SCH schematic and a (draft) layout, you can find one here:

http://www.el34world.com/Forum/index.php?topic=9498.0

With respect, 10thtx

Are these available anywhere in a format that isn't windows 95? (Windows Schedule Files) The files won't open work on even on my old XP.

Best Regards,

Steve

[M Fowler]

Steve, I have converted many of them over to other formats if there are some you would like to see let me know I can email them.

Mark

[LeeMo]

I stumbled upon a 1966 Hammond M111 organ with an AO-29 amp. I would like to build one of these amps out of it. The PT is 325-325 and the tube complement is 5u4 , 2- 6v6, 12ax7 and two 12au7's plus several other 6 series tubes. I have no doubt that the heaters are up to it . Does anyone know if I can use 6l6's or should I stay with the 6v6's? It has a 50/50 can cap and a 40/20/20 can cap that I might be able to salvage.

Thanks for your replies.

LeeMo

[Mark]

http://www.el34world.com/Forum/index.php?topic=9636.0

I might have missed something during the whole four pages, but the circuit is different from the original circuit on page 1.

Has anyone built this amp. What does it sound like?

I tried clicking on the sound links, but they didn't work for me.

[10thTx]

http://www.el34world.com/Forum/index.php?topic=9636.0

I might have missed something during the whole four pages, but the circuit is different from the original circuit on page 1.

Has anyone built this amp. What does it sound like?

Yes, a number of people have built this amp on the Hoffman forum and report liking it alot. It's also one of Geezer's innovative designs. It uses a 5879 pentode in the second gain stage of the OD.

It does sound different than a Dumble. If you can get the links to work it will demonstrate the difference better than a verbal description.

The link you referenced is a Tweed Overdrive Special (TOS) which is a different amp then the Tweed BluezMeister (TBM) that Geezer posted about on this thread.

With respect, 10thtx

[Bob-I]

I stumbled upon a 1966 Hammond M111 organ

LeeMo

Wow, cool find. I personally think it's a shame to destroy a Hammond Tonewheel organ if the tone generator can be salvaged. The M series is great stuff, especially if the pedals are included. White Shade of Pale was recorded using an M series Hammond.

[10thTx]

FWIW, I just built a Tweed BluezMeister with 6V6's.

I essentially converted another amp into the TBM so some of my component values are different in the poweramp and B+ rail. I like the amp alot as is. However, I haven't tweaked anything yet to see if I can make it even more touch sensitive.

I don't think mine is as touch sensitive in playing as Geezer's from what I hear on his soundbits. So I'd certainly follow his schematic instead of mine if you attempt this build.

I built it into a small combo cab about the size of a 5E3:

http://www.el34world.com/Forum/index.php?topic=10842.0

With respect, 10thtx

[Structo]

I love that cab!

Beautiful!

[LeeMo]

10thtx, Thanks for the link. That gives me a great start.

Bob-I , I got it for $29.95 at a thrift shop. The pedals kinda worked and the upper manual almost worked, but i didn't figure that I could not get her working for as cheap as I could build this amp and another out of the reverb amp. It had 2-12" alnico 16 ohm and a 8" 8 ohm . I plan to convert the pedals into a bass and I'll sell the tonewheels on e-bay. The cabinet will become a speaker cab with mahogony veneer. I really hated to gut her though.

LeeMo

[ampdoc1]

10thTx,

I take it you have built both the Tweed OD Special and the TweedMaster?

Can you give me a quick take on the sound of each? I've got a circuit board I designed ready to start building, and either circuit can be implemented I think.

What is the "tweed" link in these? Just the cab?

Thanks,
ampdoc1

[10thTx]

Both Geezer and I have built both of them.

I think the TBM (Tweed BluezMeister) that I built has smoother overdrive then my TOS and a larger spread tonally between clean and OD. The clean on it is warmer and fuller sounding

The TOS (Tweed Overdrive Special) that I built definitely has better harmonics and is more touch sensitive to play. However, I think Geezer feels his TBM is more touch sensitive than the TOS he built?

The TOS & TBM seem pretty comparable with sustain and blooming. The TOS has kind of a "wah" vowel overdrive that I like. The TOS also has more chime and crunch, IMO.

They're both wonderful amps just different but have similarities in the sustain and blooming features.

Originally the Tweed referred to the 5E3 tone stack in the TOS and the fact that both amps are cathode biased like some of the tweed amps were.

Hope that helps. Hopefully Geezer will weigh in on this. I know he likes the TBM better than the TOS. The reality is Geezer is a great player and makes both amps sound really good to my ears. Wished I had his talent.

With respect, 10thtx

[drew]

If someone wants an editable SCH schematic and a (draft) layout, you can find one here:

http://www.el34world.com/Forum/index.php?topic=9498.0

With respect, 10thtx

Are these available anywhere in a format that isn't windows 95? (Windows Schedule Files) The files won't open work on even on my old XP.

Best Regards,

Steve

The schematic (and layout) files that have ".sch" file extensions aren't Windows Schedule Files; they are created with a free software package called ExpressPCB. All you need to do to open the files is to go to http://expresspcb.com/ExpressPCBHtm/Download.htm and download and install the software.

[Dingleberry]

Those cleans nailed it what I had on my mind. Does the pre P.I master work well with that design?
Everybody is raving about the lar-mar and no other seems to be good at the moment. Never built a master volume P-P amp before actually, only some SE designs.
I'm thinking about building the clean channel only because I have and old chassis I can re-use and it has only five pot holes. I don't want to ruin the original looks of the amp because it looks so obscene.
And I'm after a luscious clean sound.
I was thinking to make it run with KT66's and probably add cathode/fixed bias switch. Has anyone tried it wihout neg. FB?
Some pics of the amp chassis below.

-T