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Author Topic: Trouble setting PI balance at 6VDC  (Read 17865 times)
SoundPerf
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« Reply #15 on: April 08, 2011, 05:43:47 PM »

I just ordered a vet 30 from WGS on 4-6-11 and ups shows it arriving on the 13th so its about a week.
Got an acoustic?
What's the Vet 30 for?

Yeah, I decided to put some of my equipment in the sig lastnight. I just put up the other acoustic I have. It was late and I couldn't remember the exact model number.

But yeah, the Tacoma is a very nice guitar. Solid Sitka top & nicely figured Koa sides & back. The other is a 12 string Seagull. A less expensive guitar, but still a nice guitar.
« Last Edit: April 08, 2011, 05:45:18 PM by SoundPerf » Logged

Chris

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Avatar 2X12 w/WGS ET-65 & Veteran 30
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Tacoma JK50C
Seagull S12+
T Wilcox
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« Reply #16 on: April 08, 2011, 06:00:05 PM »

The veteran 30 is going in the 2x12 from tenguitars with an ET-65.
I know its not completely recommended, we'll see.
I find the ET-65 to be really good by itself, a little dark though.
Those acoustics should keep your fingers movin while your waiting for speakers
Todd
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SoundPerf
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« Reply #17 on: April 08, 2011, 06:08:16 PM »

The veteran 30 is going in the 2x12 from tenguitars with an ET-65.
I know its not completely recommended, we'll see.
I find the ET-65 to be really good by itself, a little dark though.
Those acoustics should keep your fingers movin while your waiting for speakers
Todd
The reason I asked is I was considering this same thing. As you know I've been playing through a Vintage 30 and even though it doesn't get much praise here, I can get it to sound decent. Plus supposedly the Vet 30 is voiced a bit differently to smooth out the mid spike.

Something tells me the ET65 & Vet 30 would be a killer combination.
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Chris

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Avatar 2X12 w/WGS ET-65 & Veteran 30
TC Electronic 2290
2001 PRS McCarty
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Tacoma JK50C
Seagull S12+
T Wilcox
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« Reply #18 on: April 08, 2011, 07:13:11 PM »

I will let you know in about a week hopefully.
I remember when I first fired up the ET-65 it was pretty harsh sounding.
I read reviews where people put speakers in play for a little while then judge the tone.
When I got the speaker I played a rhytm loop on my GT-10, set the volume very high ( I live on a few acres so can get as loud as my ears can handle ), then went out for the day with my wife.
Came home a few hours later and could already hear much smoother tone coming from speaker.
This helped break in the tubes, amp and speakers and I didnt even have to be there.

I will give an assessment once the V30 has a few hours play time on it.

Todd
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plasticvonaband
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« Reply #19 on: May 06, 2011, 08:32:53 PM »

I'm not an expert on the subject, but I guess you can use both. I you use the clean channel, listen for sparkle in open G chord. If you use the OD listen for the OD overtones or even feedback.....the point where you can feedback easily is THE point.

Many people try to turn this subject into a Dumble voodoo for the selected few. IMO it's not that hard to adjust. It takes max 5 min. after the get the chassis out of the head cab.
Yeah, I don't think it's voodoo. It does take a certain tool & skill set to do it. But after that it's nothing.

I'm pretty sure I have it set where it's best. The only thing is, I hear some clips where the amp is about to feedback or "bloom" at will and what appears to be at lower volume (or gain level). I can't get that happening (atleast not yet) with my amp.

I think I read that the HRM circuit isn't as quick to do this. Is this correct?

I can say I've noticed the more I play it the more it seems to be relaxing and getting closer to the tone of some of the killer clips I hear.


I finally got around to adjusting mine the other day. mine took a little more twiddling to get the balance where i wanted it due to the fact that my PI tube is one of the Mullard CV4024's with "balanced" triodes, and brother they mean balnced!! I had to set the trimmer to 3'o clock (looking from the rear of chassis to the front) to get the voltage difference of about 6 volts, and then about 4'o clock to get it where it wanted it. It does take a little more of inbalance on the HRM BM (at least on mine) to get that bloom, but when it gets there it is tonal nirvana, and when i engage the Mega PAB holy crap!!!

I was about to sell my Strat because it sounded like crap through the BM (awesome amps can show either how good or bad your guitar is), but after tweaking the PI trimer, i have fallen in love with my strat again, and all my other axes sound even better now.

That being said, i don't think it's voodoo either, but i encourage everyone to give it a try, especially if you are using non stock PI tubes...

Hope this helps!

Gregg
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bluesfendermanblues
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« Reply #20 on: May 06, 2011, 09:08:41 PM »

I was about to sell my Strat because it sounded like crap through the BM (awesome amps can show either how good or bad your guitar is), but after tweaking the PI trimer, i have fallen in love with my strat again, and all my other axes sound even better now.
Gregg

I use a LPS sovtek PI and finding the sweet spot on the PI trimmer - never changed my amp to the degree you describe, up to the point where your guitar sounds bad.  Huh? Huh?

IMO You must have had a bad tube in there in the first place.

IME The PI trim has an important but minor impact on the tone.
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plasticvonaband
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« Reply #21 on: May 06, 2011, 09:34:53 PM »

i should probably restate what i said Smiley

i think it's more in my head than anything Wink not so much that it sounded bad, just wasn't getting quite what i wanted out of it. sounded good, but not great, and indeed when i put the meter on the pi trimmer circuit it was perfectly balanced, ie no voltage difference V3a and V3b at all, so the "balanced" triodes were doing what they were designed to do, and the amp sounded great and, well, balanced, for lack of a better term, but didn't quite get the bloom as i was after. after i made the adjustment though, i got that elusive bloom and all is well.
i think it had more to do with the tube that anything, not that it was bad, just that it is a lower gain tube and set up to be balanced and needed a little help getting that voltage swing. Long story short, making that adjustment made a great amp sound even greater Smiley
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Bluesmaster 50 2x12 combo and some guitars.
bluesfendermanblues
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« Reply #22 on: May 06, 2011, 09:42:51 PM »

i should probably restate what i said Smiley

i think it's more in my head than anything Wink not so much that it sounded bad, just wasn't getting quite what i wanted out of it. sounded good, but not great, and indeed when i put the meter on the pi trimmer circuit it was perfectly balanced, ie no voltage difference V3a and V3b at all, so the "balanced" triodes were doing what they were designed to do, and the amp sounded great and, well, balanced, for lack of a better term, but didn't quite get the bloom as i was after. after i made the adjustment though, i got that elusive bloom and all is well.
i think it had more to do with the tube that anything, not that it was bad, just that it is a lower gain tube and set up to be balanced and needed a little help getting that voltage swing. Long story short, making that adjustment made a great amp sound even greater Smiley

Plastic, are you measuring DC or AC on the PI tube .

You should adjust the trimmer with a tonegenerator connected, measuring AC and trimming until you get an equal amount of AC on each side with reference to ground. Forget the DC difference between the two halves, it will be different from tube to tube. A balanced tube will put close to equal amount of AC from each triode.
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plasticvonaband
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« Reply #23 on: May 06, 2011, 09:50:03 PM »

i'm doin the dc voltage difference that nik has in the manual. you are correct of, course i should be doing measurent in AC with a tone generator, just haven't gotten around to it yet. Although, if i have it set to where it sounds good now, is it worth doing it via the tone generator method, or should i just leave it alone for now and let it ride?
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