What should I build around this OT? (Triad S-149A)

MHProd · Post by **MHProd** » Tue Dec 30, 2014 4:20 am

Seems to be from the 70s. 3K3 Primary.

I'm thinking a Plexi 1986 (bass circuit, shared cathode) with paper in wax caps for a different flavor.

What do you guys think?

ToneMerc · Post by **ToneMerc** » Tue Dec 30, 2014 4:37 am

Would be a shame to waste the UL taps, how about a RT 66, run it at 6.6K, with 8, 16 and 32 taps?

TM

MHProd · Post by **MHProd** » Tue Dec 30, 2014 5:07 am

Hmmm, maybe.

What else?

Stevem · Post by **Stevem** » Tue Dec 30, 2014 11:48 am

If its interleaved wound ya might want to go with oil type caps !

sluckey · Post by **sluckey** » Tue Dec 30, 2014 12:10 pm

Phil_S · Post by **Phil_S** » Tue Dec 30, 2014 6:12 pm

I think you are in the sweet spot at 3.3K for a pair of EL34 @ ~400V.

matt h · Post by **matt h** » Tue Dec 30, 2014 6:19 pm

(deleted)

rp · Post by rp » Tue Dec 30, 2014 9:05 pm

That's high quality iron, if you had a pair some DIY hifi guy would get all wet over them.

You never know with untried iron but looking at the entrails the auspices are good for a Plexi, maybe very good. My only worry is that it's 50W 20-20K. Maybe too clean and tight? Maybe a 525V Plexi? Maybe one of those KT88 Parks? Maybe 4 X KT66 JTM45 super lead? The tube gods bless madness.

If the entrails prove wrong you can always just swap a Marstran etc.

Let us know.

MHProd · Post by **MHProd** » Wed Dec 31, 2014 1:52 am

Thinking about a pair of KT88 with something around 420V B+

Don't mind clean as long as it's not too tight.

cbass · Post by **cbass** » Wed Dec 31, 2014 2:13 am

matt h wrote:I'd rather double up and use it as a 6.6k-er... I'm crazy and no one likes me. Ignore this.

That's what I heard sounds good from a very good ear . keep the b+ low under 400.

MHProd · Post by **MHProd** » Wed Dec 31, 2014 5:24 am

Hmmm, I didn't consider using it as a 6K6... I'm about to start an Express build. I might try the Triad...

gingertube · Post by **gingertube** » Mon Jan 05, 2015 3:41 am

OR
A quad of EL84, Vox AC30'ish
OR
A quad of 6V6 for a "mini" Bassman.

Either of these 2 options will give you around 30 Watts and both sound great.

Cheers,
Ian

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What should I build around this OT? (Triad S-149A)

What should I build around this OT? (Triad S-149A)

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