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Posted: Tue Jun 15, 2010 8:23 am
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Among the dual-triode sub-miniatures, the 12AY7 is a very low-gain tube (regardless of circuit configuration). I'd be more concerned that you won't care for the tone at all rather than for any safety issues. Why not give the 12AT7 a try first and see what sonic effect that has?

As for 6L6GCs I usually favor NOS milspec JANs of one persuasion or another (RCA blackplates are my preferred bottles). That said, someone recently gave me some new EH 6L6s which I've been field-testing in a '67 Bandmaster. In all honesty, they sound mighty good (biased at 33 mA) though I harbor no illusion that they'll last for decades as with vintage-made GI-issue glass.

HTH

Arjay

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Posted: Tue Jun 15, 2010 8:33 am
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I have a few 12AT7's laying around, to be honest I have yet to try anything new in the amp.

It has green groove tube 12AX7's in it < I assume they are original as all three are the same.

I'm most likely getting the cart before the horse with the whole power tube and rectifier tube changes ahead of the preamp tubes.

The reissue jensens are most likely a big part of the problem too.

Hey my last amp was a Clark Piedmont with tone for days, this is a step backwards for sure !!!

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Posted: Thu Jun 17, 2010 2:39 pm
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So far I've installed two Weber CTA 10 Alnico speakers (bottom half)
installed a NOS Tung-Sol 5U4GB and two reissue Tung-Sol 5881 power tubes.

I have two more weber Sig-10's coming (not the "S" series) for the top of the cab.

The 59 bassman RI LTD is starting to sing !!!

The tubes helped, but the speakers opened up the notes like you wouldn't believe, Its ALIVE !!!! breathing and swirling like a bassman should.

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Posted: Thu Jun 17, 2010 2:56 pm
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blues bondsman wrote:
Its ALIVE !!!! breathing and swirling like a bassman should.


KEWL!

Arjay

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Posted: Fri Jun 18, 2010 5:47 am
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The Weber speakers will only get better with time if you don't abuse them.
I use them in my vintage amps and the sound is constantly improving it seems,even after a few years.


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Posted: Fri Jun 18, 2010 7:39 am
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The sig 10's will be here today, I'm thinking it will be a grand unveiling.
I'm real suprised that Fender uses the wannabe Jensens.

I get the whole keeping the price down thing, its just wow what a difference !

And hey the Jensens sound "good" just not great.

I am watching and so far no overheating with the tube change.
I ended up with a NOS Tung-sol 5U4GB and the RI T/S 5881's
So far so good, I have let it warm up a bit longer on standby before playing too.

So far its been a good experience.

Side note, Fender gives you just enough speaker wire so you can't clip off the slide ons and directly solder to the speakers.
I may have to rewire.

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Posted: Fri Jun 18, 2010 9:00 am
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If a new speaker wiring harness is required be sure to use AWG18 or larger multi-strand wire and use the shortest runs practical.

Glad to hear the speaker and tube upgrades are working out. To prolong the life of your bottles, let your amp idle in standby for ten to fifteen minutes before shutting it down completely after a gig or jam.

HTH

Arjay

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Posted: Sat Jun 19, 2010 8:45 pm
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Thanks for the tips !

The Tung-Sol 12AX7 RI showed up yesterday, however we have no power, Huge storm wiped out everyone east of chicago and 30 hours later we still have no power.

The Weber sig 10's are in the cab now too, can't wait to have some juice in the lines again !!!!

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Posted: Sat Jun 19, 2010 10:21 pm
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Yeah those two storms rolled through here yesterday evening, lots of wind, but I'm 65 miles NW of Chicago. Hope you got the power back by now. Hey Arjay, I used to idle down the tubes just like idling down a semi, but have changed my thinking on that. Out here you have to respect the winter transit situation, but what is your thinking on the prolonged cool down. IMO At room temp the tubes will cool down at a much slower rate than their warm up period. With the heaters running at 700- 1100 degrees F the cool down would be really extended. Art

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Posted: Sat Jun 19, 2010 10:22 pm
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Ouch, that blows!

We have periodic problems during our summer monsoon season so I bought one of those Honda 5kW portable generators......it makes enough "juice" for the important stuff.

You know -- the fridge, the 'puter, the coffee maker, a Twin Reverb. Important stuff!

:mrgreen:

Arjay

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Posted: Sat Jun 19, 2010 10:33 pm
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aclempoppi wrote:
With the heaters running at 700- 1100 degrees F the cool down would be really extended. Art


Twew dat, but with the heaters lit it makes the de-ionization process for the other (idling) elements in a tube less dramatic thus preserving those delicate coatings on the screens, cathodes, and grids. The start-up and shut-down procedure is the hardest on a tube (just as an incandescent lightbulb) so anything that ameliorates that process is preferred. As well, when the coatings within a vacuum tube's elements begin to deteriorate they generate gas -- another detriment to the service life of a tube.

HTH

Arjay

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Posted: Sat Jun 19, 2010 11:46 pm
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Like that word"ameliorate", made me grab the Webster. I follow and agree with the basic idea of slow change being a benefit. But I have a problem with the idea of "ion poisoning". It's my understanding that this can only occur on hot elements, not cold elements. Because the elements cannot absorb the ionization when cold. But you know what pal, we're talkin' about friggin' guitar amps! How the hell did all this get so important? I think I better get back to those sixth's and double stops ! Art

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Posted: Sat Jun 19, 2010 11:57 pm
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Probably true. I'm still slightly "medicated" from my recent gall bladder surgery. Love that vicotin!

:mrgreen:

Arjay

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Posted: Sun Jun 20, 2010 6:47 am
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Winds got as high as 80 MPH !!!
twisted two large oaks right out of the ground and my mothers house.
Both just missed her house.

I'm doing the holiday inn thing right now, hopefully today !!!!! we will have electricity.

Had to remove the bells from the two top webers to make them fit, I'm sure it will affect the tone darn it. LOL

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1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

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Posted: Mon Jun 21, 2010 9:36 pm
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well the T/S 12AX7 RI tubes are in place and well ?????
No great improvement over the Groove Tubes that were in it.

I'm thinking its 5751 time, now all I have to do is find the darn things !!!

Or pick some up at my tube amp guru's shop.

So another question for you guys who have dealt with weber speakers.
is it possible that they put the possitive side on the left on one style and the right on another ????
Seems kinda wierd to me, however the CTA 10's have red paint on the right, the sig 10's are on the left.
(holding the speaker with the bell facing you and the contacts at the bottom)
I used my ohm meter to bump the speakers and they seem to both push out when voltage was applied with the possitive on the Red terminal.

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2004 50th Ann. Limited edition AMSE Stratocaster
2017 50's Baja Telecaster BSB

1968 Bandmaster with 2X12 cab C-rex speakers
VHT Special 6 Ultra combo

Visual Sound Route 66
Cmatmods Signa Drive


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