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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 10:12 am
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bluesstrattone wrote:
http://www.amp-head.com/product_info.php?cPath=21&products_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.


This is the probe you should get:

http://www.amp-head.com/product_info.ph ... ucts_id=70

It is the one I use and it also allows you to safely measure plate voltage which you will need to do. Trust me when I say it is better than trying to measure plate voltage with just a DVM. :shock:

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 10:26 am
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Thanks retro, thanks bill,
I'm happy that someone has used that bias probe,
You I've. been part of this forum for some time now.
I've learnt alot , more so than if I were on my own.
I've learned how to set up my strat, change pickups, pots,
Change tubes, hopefully by the end of this amplifier
Adventure, how to bias my amp.
Really thanks guys...
Bst, or simply Joe

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 11:20 am
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No problem, Joe.

When we're dead and gone it'll be you helping out the younger players.

Arjay

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 9:36 pm
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ok so im trying to absorb this and apply it.

ok so v1,v2 either 12Ax7A (any particular brand?) or 7025 preferbly TAD's right.
v3 is 12AT7 and V4 12AX7 (reverb?)
V5 is tremolo is this 12AX7 or 12AT7 ?
and V6 is the PI correct only this one needs to be balanced?

V7 and V8 are the power tubes and V9 rectifier tubes. ill by those last.
sorry im trying to organize my thoughts, so i can systematically order the tubes,
shop around.

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 10:22 pm
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Your V1 through V6 can be any quality brand -- TAD's, JJ's, EHX, whichever you can find the best price(s) for. The V6 12AT7 should be pre-tested for balanced trans-conductance -- expect to pay a slight premium for that specification.

Best of luck, HTH

Arjay

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 10:44 pm
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Here's a few links you need to bookmark that will help you with your DRRI, I refer to them often...

This explains what each preamp tube does and what to put in there

https://www.kcanostubes.com/content/fender-amp-preamp-tube-layout-and-recommendations

Call the Tube Store and they can put something together for you, they also have tube packages. I haven't tried their preferred series 7025 (12AX7) but I did order a pair of preferred series EL-84 for a different amp and they were excellent! I just might try a 7025 from them one day...

http://thetubestore.com/65deluxere.html

Fritz mods, should you decide to do them

http://www.fenderforum.com/userphotos/index.html?recid=48201

http://www.fenderforum.com/userphotos/index.html?recid=64631

Bias calculator

http://www.webervst.com/tubes1/calcbias.htm

Fender amp field guide, great source of info for all Fender amps.

http://www.ampwares.com/fender.asp


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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Wed Mar 30, 2011 11:09 pm
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Schematics for most Fender tube amps may be found here......

http://web.archive.org/web/200807170341 ... fender.htm

Arjay

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Thu Mar 31, 2011 2:01 am
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From what others have told me about the '65 DRRI, it is quite hard on its 12AT7's. Both the PI and reverb driver tube. It's not unusual, like Shimmy said, for one half of the PI 12AT7 duo-triode to wear before the the other half. This can lead to oddball saturation or asymmetric clipping (odd bass or farting tones), from the phase inverter. And weak reverb for the reverb driver.

I usually use mil spec JAN Sylvania 12AT7WA or Philips JAN 12AT7WC for this reason. These are tough cookies and are over-rated for current. They are still reliatively cheap ($8-15, NOS). Maybe worth a try.

http://www.ampwares.com/schematics/65_D ... erb_RI.pdf


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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Thu Mar 31, 2011 2:59 am
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So much info, so little grey matter!!!


Thanks guys!

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Thu Mar 31, 2011 7:33 am
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Thanks, alot of great info that makes more sense why to
Get better tubes for specific areas.
Thanks BMW this does help alot.
Gotta love the Internet , spent about 4-5 hrs researching
Of course while on the clock, since I have time through out
The day.

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Thu Mar 31, 2011 8:20 am
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BMW2002Ti wrote:
From what others have told me about the '65 DRRI, it is quite hard on its 12AT7's. Both the PI and reverb driver tube. It's not unusual, like Shimmy said, for one half of the PI 12AT7 duo-triode to wear before the the other half. This can lead to oddball saturation or asymmetric clipping (odd bass or farting tones), from the phase inverter. And weak reverb for the reverb driver.

I usually use mil spec JAN Sylvania 12AT7WA or Philips JAN 12AT7WC for this reason. These are tough cookies and are over-rated for current. They are still reliatively cheap ($8-15, NOS). Maybe worth a try.

http://www.ampwares.com/schematics/65_D ... erb_RI.pdf

I agree, just recently found out how important those 12AT7 are, specially for reverb. Kept feeling something wasn't right with the reverb, had a tech look over my DRRI and he replaced both 12AT7 and it sounded so much better!

I will probably look for some NOS 12AT7 to make sure this doesn't happen again. I have enough 12AX7 now...


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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Thu Mar 31, 2011 11:03 am
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Let me ask you guys something, the 5751 for v2, for "srv"
Tone, is it all gimmic or is this an option you've tried and
Disliked.
Sounds interesting

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Thu Mar 31, 2011 11:43 am
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I don't personally care for the 5751 but it's a perfectly legitimate option if it suits your ear. It's a totally reversible "mod" -- give it a try.

Arjay

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Thu Mar 31, 2011 12:24 pm
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bluesstrattone wrote:
Let me ask you guys something, the 5751 for v2, for "srv"
Tone, is it all gimmic or is this an option you've tried and
Disliked.
Sounds interesting


I don't know about "SRV tone", but I use a Phillips JAN 5751 in V1 of my Blues Deluxe Reissue (JJ 12AX7/V2, JJ 12AT7/V3, and JJ 6L6GC/V4/V5). I use it (along with the 12AT7) primairly to lower the overall gain of the amp, but I do find that I prefer the sound of the 5751 to a 12AX7 in V1. V1 is the usual recommendation for the position of the 5751, not V2.

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Post subject: Re: 65 DRRI few issues,farty on a few notes.
Posted: Thu Mar 31, 2011 1:03 pm
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The 5751 in V1 or V2 will give you a little more clean headroom, I had one in there for a while, but I prefer the 7025 with the DRRI, I actually like the breakup I get from the amp and I don't have to use a tube screamer as much if I needed more drive...

Only do it if you're looking for more clean headroom.


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