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Post subject: Re: Advice-Opinions
Posted: Sun May 31, 2015 8:29 pm
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sfceric64 wrote:
a new question about using the attenuator; say I have another 8ohm 1x12 cab I want to run. I will guess that the 2nd speaker output from the amp bypasses the Atten. out of that jack so I would need a Y out of the attenuator and adjust the ohm setting to 4ohms, is this correct?


Assuming the additional speaker is 8Ω then yes......you'll need to configure the attenuator for a 4Ω load and use a Y-cable.

Arjay

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Post subject: Re: Advice-Opinions
Posted: Sat Jun 13, 2015 8:46 pm
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Well I got the attenuator on Friday and finally played with it today for a few hours.
It cuts about 50% of the loudness as expected but also enhances the power imbalance to the 100W speaker by the same 50%. So, I guess now I'm on a new speaker hunt and looking for a spare set of tubes for backup.
I guess I have about 500+ hours on the tubes & speaker.
It was a lot harder to dial up a tone I was happy with through the underpowered Jensen; although the overdriven tubes provided the enhancement I wanted. I believe a 20-40watt speaker should be about right either attenuated or bypassed. Since the attenuator comes w/ a 3db or 6db treble boost and the amp is a treble monster to begin with would you recommend a tighter cone material on a new speaker to limit some of the top end? The amp is un-modded so far but that may change in the future and thought the boost might offset a mod.


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Post subject: Re: Advice-Opinions
Posted: Sat Jun 13, 2015 9:07 pm
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You might try a Weber 12A150 with light doping or an original Chicago-made Jensen P12Q. The alnico magnet structure will add some warm compression to the mix while the less-efficient Jensen would break up at lower volume levels.

Arjay

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Post subject: Re: Advice-Opinions
Posted: Sat Jun 13, 2015 9:25 pm
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For sure the Weber A/F models are my front runners @ 25 Watts. There are so many quality speakers out there, I wish Weber put up spec sheets on there site. I haven't searched the web thoroughly so they might be available somewhere. Makes it much harder to compare w/o actually playing through a similar amp.
Also looking at WGS, Celestion, Emminence and a couple others.
Do the Webers bolt in w/o any DIY.
Thanks for the help, Arjay

Eric


Last edited by sfceric64 on Sat Jun 13, 2015 9:45 pm, edited 1 time in total.

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Post subject: Re: Advice-Opinions
Posted: Sat Jun 13, 2015 9:42 pm
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The Weber should be a drop-in fit like *most* of the others. However, most Celestions use a four-screw mounting flange -- you'll need to remove four fasteners from your amp's baffle board. The only Celestion I'd really recommend for your operating parameters is the alnico "Gold" model. I believe they're rated at 40 watts which shouldn't be a problem when using an attenuator.

Arjay

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Post subject: Re: Advice-Opinions
Posted: Sat Jun 13, 2015 9:49 pm
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Thanks again.
Probably look at getting something started early next week on both fronts, speaker and backup tubes.


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Post subject: Re: Advice-Opinions
Posted: Tue Jun 16, 2015 1:08 pm
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Whats you opinion on these tubes for a modest budget in the 65DRRI

V1: JANGE5751 lowered gain, tighter bass, mellow compared to the stock GTecc83s
V2: JANGE5751
V3:JANphillips12at7wc definitely improved the reverb(much smoother when overdriven)vs stock
V4:JJ12ax7smg harder to define the changes from the stock GTecc83s
V5:replaced stock12ax7r w/GTecc83sfrom V4, seems to be a slight improvement in defining the speed/intensity of the vibe
V6:JANPhillips12at7wc , stock Chinese tube,JJecc81,Fender label 12at7EH(long plate sounded a little smoother to me than all the short plates I tried, but was cold the second time I powered up) a stable PI is morest importante and the Phillips is the better tube for me in the PI and the reverb driver as a bigger tone influence, not much difference between the jjecc81and the stock tube
V7:EH6V6GT for backup, the stock JJ6v6s sound pretty good to my ears
V8:EH6V6GT
V9:stock

Ordered the Weber 25WA150 today, so I have a 7-10 window to find new tubes.

thanks,
Eric


Last edited by sfceric64 on Wed Jun 24, 2015 8:11 pm, edited 4 times in total.

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Post subject: Re: Advice-Opinions
Posted: Tue Jun 16, 2015 3:38 pm
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The combination of a 5751 and a 12AU7 in the vibrato channel may sacrifice a significant amount of overall gain. If that's your intention, you've chosen wisely. If not......

Arjay

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Post subject: Re: Advice-Opinions
Posted: Tue Jun 16, 2015 5:09 pm
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So I was thinking of getting both 5751's but probably leaving V1 open and that I could still have some flexibility to swap the V3 & V6 since they are the cheapest. My goal for V3 was to try and clear up the overdriven reverb (its fine until about 5 then gets muddy) while transitioning the pre side to a little less power. I have no clue what mine is but have read other posts where plate numbers were between 400-460. I figure the lower the better for the output tube lifespan.
Haven't really looked under the hood to much further, at this point. Will the lower power help the reverb being squashed? Not really sure I thought aboot gain though...


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Post subject: Re: Advice-Opinions
Posted: Thu Jun 18, 2015 12:52 pm
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Thinking about what you said, I decided to play it safe, not knowing the effects through my EARs.
I edited my tubes list but bought a couple extras, for experimentation purposes...


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Post subject: Re: Advice-Opinions
Posted: Thu Jun 18, 2015 1:51 pm
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I don't think your original choice of tubes would cause the amp any harm. Try them -- it may provide the tone you seek. If not, the change is easily reversible.

Arjay

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Post subject: Re: Advice-Opinions
Posted: Thu Jun 18, 2015 9:17 pm
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Retroverbial wrote:
I don't think your original choice of tubes would cause the amp any harm. Try them -- it may provide the tone you seek. If not, the change is easily reversible.

Arjay


Roger that; I figured I should have the at7's available if I prefer their tone and will experiment with the au7's. I'm hoping the biggest tonal change via tubes will be the V1/2 and the rest are gonna be minor improvements over the stock assortment. I'm gonna run as many options as I have available in V3 and V6 to tame the reverb when overdriven. All the experimental with the Jensen, since its already in place, broken in and I know what it normally sounds like. I'll decide which I like best, then change to the new speaker. Spend a little while breaking it in and then repeat the test to get a better idea of the tubes value in the chain.


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Post subject: Re: Advice-Opinions
Posted: Mon Jul 13, 2015 12:49 pm
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Whew, had to wait my turn...
Seems the good folks at Weber are busy, but I finally received my new speaker last Friday.
It was a snap to replace the Jensen, maybe 15 minutes....
Got several hours in over the weekend, some initially high levels during the daylight hours to taste the speaker.
Had a little fluff in the very bottom end, but that turned out to be an installation oversight. I didn't get the baffle board in one corner snugged down properly, easy find and fix.
Looking forward to getting it broken in completely.
My initial impression is that it has definitely helped to tighten everything in the amp up a bit, lows to highs as well as the reverb vs the 100w Jensen which imo allowed the amp to do its thing but didn't really contribute as much to shaping the output. I do have some fears of being able to blowout the Weber at only 25w, but will use the attenuator to avoid that most of the time.

As far as tubes go, I'm gonna stick with whats in there now for a while but will definitely look to try a few more out in the future as I'm able to afford and find them.


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Post subject: Re: Advice-Opinions
Posted: Mon Jul 13, 2015 2:28 pm
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That Weber won't really start to sing until you've logged 30 or 40 hours on it. Even the speakers they sell that are "pre broken-in" need some additional play time before their tone becomes fully matured.

Rawk on!

Arjay

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