loading 4x6v6

[Andy Le Blanc]

Anybody have practical experience with quads of 6v6?
What load would 4 x 6v6 like to see?

[wicker]

4k

[Andy Le Blanc]

I figured that too, I just haven't fiddled with it yet, how far down from 4k
can you go before you start to run into practical issue's, 3k, 3.5k.
I know there's a sweet spot for power vs. distortion in there somewhere.
Or is it a little higher?

[dobbhill]

My reading, not direct experience, tells me that optimum load depends upon B+. Also, according to Trainwreck application, optimum textbook load does not dictate "best" tone. Mr. Fischer used 5.2-6.6K trannies on a pair of EL34, where Marshall and Dynaco used 4.3K. He also said you could run 6V6 in those same amps. I guess guitar tone is not the same as Hi-Fi tone, and losing a few watts in preference to better tone and feel is an acceptable trade-off.
I don't really know anything, just repeating things I read. I tend to follow what others have done successfully.
I'm also OK with being wrong. It helps when trying to stay married.....
D

[funkmeblue]

the dynaco 470 would be awesome for this use if you are in the "tweed" voltage range. Tweed deluxe uses an 8k tranny and half of that is 4......now if your in black face voltage range which would be a 6.6k tranny, I would use a 3.3k tranny.

[Andy Le Blanc]

That the thing, where is the inside of the ballpark anyway.
There really is a trade off for voltage and load. The relative distortion figure
to power change together.

[Jana]

3.5 to 4K.

[tubeswell]

Anywhere between 2k5 and 6k6 will work, with something between 3k5 and 5k sounding good.

I have run 6V6 pairs from anywhere between 5k to 10k. At 5k 370V on the plates they sound really good - compressed, although not as powerful as 8k. (That's why I say you could run a quad of 6V6 at 2k5.)

[wicker]

as mentioned this is not hifi, technically it would be good 3.8-4.2 probably, but who cares in most guitar amps power tubes (and preamp too) are often put to it's limits and everybody seems to be happy, cos it's all about the TONE ; )
I would suggest to try wi Ra that would fit both for quad 6v6 and 6l6,el34 as well (most will do that)

[Phil_S]

If you've got free time on your hands or have trouble sleeping :
http://www.siteswithstyle.com/VoltSecon ... _LINE.html
There's a bucket load of stuff on load lines here:
http://greygum.net/sbench/sbench101/

[Andy Le Blanc]

awesome thank you. The next issue is a PT 500ct 300-350ma.

one electron BFT-1B?

[Phil_S]

If I had that BFT 250-0-250 300ma, I'd look to build something with a sextet or octet of 6AQ5, 6V6, or EL84, 60-80W range. If it can handle the current requirement for the 8-pack (you'll need an aircraft carrier size chassis and possible a supplemental filament tranny, depending) you ought to be able to find a 2K or 2.5 OT that's perfect for the job and that won't cost you an arm and a leg, because who uses a 2K OT rated for 80w? There must be one around somewhere. Same probably for the 6-pack...I think you'd be good with an OT of 2.5K or even 3K, 3.5K. Finding a ~3K rated for 60W should be easier. Any project of this type grows arms and legs quickly.

You have a roadie to help you carry it around?

[Andy Le Blanc]

Depends upon how you load it, I'm cheap, could use any 4k or 2k opt
with proper loading. I should be able to push 6v6 to 16w total dissipation for
each device, with a design max 350v plate voltage, static.

So..... the one electron product is rated 520v ct, 360 ma

after full wave rectification I should have around 370v, not gonna push volts.

It should consume 43ma per tube static, 170ma total at idle. The cheesiest
twin PT I can find is 310ma/690ct, which after full wave rectification is
around 490v. A deluxe is around 420v at the plates.

I do not want a fender tone, I will not be going for a fixed bias , high plate
voltage, feed back neutered turd.

[Jana]

I have a couple of 2.5K OT rated at 150 watts continuous.

[Andy Le Blanc]

twin opt = 2k
marshal 100 w generic opt = 1.7k
marshal jcm 900/2000 opt = 1.75k

Like I said, CHEAP, loading is everything, and it works. 4k, 3.4k and 3.5k.