6V6 ODS...

[v00d00blues79]

Has anyone done a 6V6 ODS? I just got one of the chassis from Brent and its a 100W chassis. I'm thinking about doing a 4X6V6 switchable down to 2 for 1/2 power. Something similar to the Larry Carlton ODS. Just looking for opinions on the sound.

Thanks,

Andy

[Normster]

Has anyone done a 6V6 ODS? I just got one of the chassis from Brent and its a 100W chassis. I'm thinking about doing a 4X6V6 switchable down to 2 for 1/2 power. Something similar to the Larry Carlton ODS. Just looking for opinions on the sound.

Thanks,

Andy

Man, we're on exactly the same wavelength.
I talked with Scott about this yesterday and his suggestion was to build the 100 watt and get it dialed. Then switch it over to the 50/25 6V6 model.

[v00d00blues79]

Sweet! I'm still in the parts sourcing stage of this adventure, so i won't really have anything to add until i get moved into my new apartment and things settled back in. I'm just wondering about the difference in tone though between the 6L6 and the 6V6. They do seem to compress differently when driven hard, and i don't want to lose the nice cleans...

Thanks,

Andy

[v00d00blues79]

So, i've been thinking about the last post, and i'm wondering if I use JJ 6V6's, it should be possible to swap the 6L6's with the 6V6's with just a re-bias? Am i correct in that assumption? The JJ's will take 475v on the plates with no problems from what i'm hearing.

Thanks,

Andy

[LeftyStrat]

I've run JJ 6V6's in a JTM45 with 460v on the plates, with no problems. It is a stout little tube.

Another suggestion would be to wire up two different bias pots, and use a switch to select between a pair of 6V6's and 6L6's.

[v00d00blues79]

I was thinking about that as well. Would running the 6L6's and 6V6's in parallel and switching them out for different power levels be a possibility? Something similar to the simul-class circuit?

Thanks,

Andy

[caglej]

I am also interested in a 6v6 version. What OT would be appropriate? Would a deluxe style 6.6k work alright?

[toneman]

Workin the bugs out now ,ran the 4- JJ's up to 455 with out hint of problems. BUT I'm not comfortable with that on a 6v6. Did try 2- 6l6's before I dropped the voltage . Sounded tight,cleans were great and the drive ..trying to smooth it out. 2 -15 volt 5 watt zenners on the center tap and a bias set resistor change brought the voltage down to 420. It was still tight with the 4 - 6v6.Want to make sure everything functions right before I really tweak it in. Right now I'm building the add on relay for HRM mode to non HRM. There was a concern over impedance from one circuit to the next. Had it working from the panel pedal switch and it worked fine including the boost. But I had changed the OD1 cap from .01 to .002 and the OD 2 cap from .005 to .01 for the grins. Clean still sounds pretty good and the drive in the HRM mode sounds good the non HRM has got some bight- think ZZ. Not ready to fine tune just yet. On the trimmer it seems less is more if that makes sense. Don't know the value for the snubbers on the OD yet. Using 330 pf for now. Might have to find a happy medium between the to modes.I'm sure that will change. There is a Pent/ Triode switch and a half power switch. The P/T sw is on the center tubes and the 1/2 Power is on the outer tubes, both work fine. I'm sure there are questions please e:mail and I'll go in to more detail. There is potential in the HRM to the non HRM mode via relay. Kinda like the HRM mode ,a little darker. Probably due to the 33k slope in the tone stack.

[Bob-I]

I am also interested in a 6v6 version. What OT would be appropriate? Would a deluxe style 6.6k work alright?

I built a 6V6 Dumble using a Deluxe type xformer and was somewhat dissapointed at the results. I have a B+ of about 380V so most 6V6's were fine, but the overall tone was thin. I replaced the 6V6's with 6L6's and rebiased and it was better, but it really came alive when I replaced the OT with a Bassman type using the JJ 6V6's at the same 380V.

This amp is the one I built into an old Crate cabinet. I now have an old JBL D-120 in it and it sounds great. It's still damn loud but more controlable than a 100 watt amp for sure.

Here's a clip... again....

http://www.patmedia.net/bob-ingram/Dumble/Bob-I.mp3

[caglej]

Thanks Bob,

That clip sounds great! I'm using the Weber 18 kit as a platform. The outer PT taps are 340-0-340, and I think I'll try the 4k OT connected so that it's 8k. Hopefully the OT will sound alright, but if not maybe I'll try a bassman OT as you did. Where did you get yours?

[toneman]

Power trans is a fender bandmster 125P7D and a generic 50 watt 2-4-8 ohm tap with a 500 ohm R choke and is thick sounding at 420 V. Will post pics and clips soon

[Bob-I]

Thanks Bob,

That clip sounds great! I'm using the Weber 18 kit as a platform. The outer PT taps are 340-0-340, and I think I'll try the 4k OT connected so that it's 8k. Hopefully the OT will sound alright, but if not maybe I'll try a bassman OT as you did. Where did you get yours?

Mine is a Mojotone. I've had good luck with these as well as the Bassman replacements from AES, http://www.tubesandmore.com .

I'll bet the Weber will sound decent too.

[MarkB]

Bob

Did you use the Bassman OT straight up with the 6V6s? No impedence adjustment at the speakers?

[Bob-I]

Bob

Did you use the Bassman OT straight up with the 6V6s? No impedence adjustment at the speakers?

No, I'm using the 4 ohm tap on an ohm speaker.

[MarkB]

Bob

Did you use the Bassman OT straight up with the 6V6s? No impedence adjustment at the speakers?

No, I'm using the 4 ohm tap on an ohm speaker.

How many ohms speaker, Bob?