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Post subject: 65 DRRI few issues,farty on a few notes.
Posted: Sun Mar 27, 2011 8:32 pm
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a few issues, 1 i believe 1 of the tubes is microphonic, makes a tiny ringy sound but not all the time.
also a few farty notes, closer to the 12 th fret.

other than that it sounds great, tone is awesome.

i counted about 9 tubes, i plan on replacing all tubes. rebiasing.
suggestions on tubes, and biasing kit.

speaker works perfect, i plugged it into the superchamp the speaker i mean.

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Sun Mar 27, 2011 10:48 pm
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bluesstrattone wrote:
a few issues, 1 i believe 1 of the tubes is microphonic, makes a tiny ringy sound but not all the time.
also a few farty notes, closer to the 12 th fret.

other than that it sounds great, tone is awesome.

i counted about 9 tubes, i plan on replacing all tubes. rebiasing.
suggestions on tubes, and biasing kit.

speaker works perfect, i plugged it into the superchamp the speaker i mean.


Be sure to use some good quality 12AX7A tubes in the V1 and V2 position. These are the 1st and 2nd stage pre-amp bottles for both channels. The added "A" to the nomenclature designates a lower noise floor and better S/N ratio. Thus, the amp will idle more quietly. The 12AT7 in V6 should be selected based on balanced transconductance between the two sections of the tube to maintain symmetry within the power tubes and tranny at the output stage. The Tung-Sol re-issue 6V6GT seems to be a well-built bottle; JJ's or TAD's are also very good. Your V9 rectifier should be selected based on absolute reliability and durability since it is the hardest working tube in the amp. I've had good luck with the Sov-Tek GZ34/5AR4.

Best of luck, HTH

Arjay

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Sun Mar 27, 2011 11:46 pm
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Let the fun begin...

Here's what I can tell you about the farty notes, mine were mainly the lower notes, specially open low E and A. Two things you can do, the right tubes and proper bias, and/or change speaker. I would start with tubes and bias.

If you want the best tone, I'll say it again, NOS RCA 6V6. For preamp, there are many choices... but my amp tech just proved to me that not all preamp tubes are equal, even new "tested" tubes. After a few tests here's what I found to work best, for me:

TAD 7025 are excellent in V1 or V2.
The JJ 12AT7 (ECC81) are not bad, so is their "balanced" phase inverter in V6 that Arjay mentioned. (FYI, I hated their 6V6, way too harsh)
2 very important tubes are V3 and V4, I ignored those tubes in the past, had JJ, Tung-Sol, GT... always felt something wasn't right with the reverb. Once good tubes were in there the reverb was so much sweeter! You'll need a very good 12AT7 in V3 and a really good 12AX7 in V4. I just picked up some RCA 12AX7 and they are perfect, but so is the TAD. So I have the RCA in V4 and the TAD is in V1 or V2.
V5 is not that important, I don't even use tremolo...

I've been using the JJ GZ34 rectifier for many months and have no problems whatsoever. The only other rectifier I tried was the crappy Ruby that came with the amp and a replacement GT, both rattled.

That's about it, I'm sure others will give their opinion as well...


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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Mon Mar 28, 2011 5:22 am
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So you hated the JJ 6V6s?
I had thought about trying them and some RI Tung-Sol 6V6s just to see which sounded best in my amps,just to save the NOS tubes I have.
Have you tried the Tung-Sols?....I know some people have mentioned them.


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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Mon Mar 28, 2011 10:33 am
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Did I say I hated them?? Hate is such a strong word... I disliked them :) I didn't like what they did to the tone, no matter how I biased them the DRRI lost that sweetness it's known for and sounded kinda harsh.

I tried 2 sets of Tung-Sol 6V6, loved the first set, til one of the tubes developed a rattle. Then I got another set to keep as a backup, I already switched to RCAS, they sounded nothing like the first set :? my fault for buying them from ebay, they were brand new and perfectly matched. The first set came from the Tube Store and sounded very sweet, very similar to the RCAs. I might try some TAD 6V6 next, been very happy with their preamp tube, and since the Tube Store sells TAD tubes I feel comfortable placing an order. I've gotten 6L6, 6V6, EL84 and a few preamp tubes from them and every single tube was perfect.


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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Mon Mar 28, 2011 12:58 pm
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How was the biasing part, you ordered a kit right?
How much was the kit?

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Mon Mar 28, 2011 2:46 pm
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I got the Weber Bias Rite but their site says it's discontinued for some reason... it's very easy to do actually.


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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Tue Mar 29, 2011 5:05 pm
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retro,
wonder if these would be the best route for me.
https://ssl.eurotubes.com/cart/index.ph ... gory_id=35

considering i want to order from one spot.
so many choices.
i do need biasing tool kit.
would this suffice?
https://ssl.eurotubes.com/cart/index.ph ... ory_id=109

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Tue Mar 29, 2011 8:35 pm
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As I mentioned before, the JJ 6V6 sound too harsh in the DRRI, the rest of the tubes are ok. You're welcome to try it though, maybe you'll have better luck... but I'm not the only who feels that way about 'em.


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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Tue Mar 29, 2011 8:47 pm
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bluesstrattone wrote:
retro,
wonder if these would be the best route for me.
https://ssl.eurotubes.com/cart/index.ph ... gory_id=35

considering i want to order from one spot.
so many choices.
i do need biasing tool kit.
would this suffice?
https://ssl.eurotubes.com/cart/index.ph ... ory_id=109


As CB mentioned, the JJ 6V6 leaves a lot to be desired (hell, he sent me the pair that he bought because he couldn't stand the sight of them in his tube stash!).

:lol:

I'd go with the Tung-Sol re-issues or, if you can afford it, something NOS vintage. As far as any bottles from Eurotubes, skip the "gold" option -- it's all hype. Unless every one of the pin receptacles in every one of your tube sockets were gold, it won't make a tinker's damn worth of difference in terms of continuity, tone, or anything else.

The biasing probe is a good one, at a good price.

Exercise extreme caution while using it.

HTH

Arjay

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Tue Mar 29, 2011 9:56 pm
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http://www.amp-head.com/product_info.ph ... ucts_id=31

i found this dual bias probe, that will help out.

what is or does a balanced phase inverter to to an amp and how is it relative to the tubes? :mrgreen:
im gonna have to make a grocery list, on TADS, tunsol RI, yeah the rca nos are too expensive for now.
considering i need a biasing kit, and tubes. at the cheapest cost high quality im looking at around 50 -60 bucks for the kit and 100-140 for the tubes.

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Tue Mar 29, 2011 10:21 pm
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Go here to read shimmilou's dissertation on the phase inverter and its overall impact on amp performance......

viewtopic.php?f=13&t=53510

It's the most concise that you're likely to read -- anywhere.

HTH

Arjay

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 3:22 am
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Never ordered tubes so not sure on reputable sources...
I looked at a couple of sites for 12AX7A and found none.

I'll probably order that bias-tester from Eurotubes though.
Or is that dual bias-tester the better deal?

Any references for suppliers would be appreciated.

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 9:41 am
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Thanks retro, read shimilou's explanation, makes more sense
Another question, would I need the other preamp tubes
Balanced and matched, or are they selfstanding.
The more i learn on this issue, the more excited i get
On retubing and biasing correctly.
Ps I know they are labeled v1 etc on schematics, but is
That their specific order?

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 9:56 am
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Yes, the "V" designations are ordered to correspond to the locations shown on the cab's tube chart, read from right to left.

Balancing and/or matching is not necessary for the other tubes (V1 through V5, inclusive). But of course, they should be quality glass with adequate gain and no hint of microphonics.

Arjay

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