What's to chat about?

Anything not covered elsewhere.
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Rich4349
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Re: What's to chat about?

#1126 Post by Rich4349 » Sun Nov 28, 2021 6:06 pm

Oh, I meant online. The past couple years Black Friday and Cyber Monday have basically schmeared into one long spend-a-palooza.
2 DR250s, 2 27" Lab15 T-60s, 2 30" Neo Titan 39s, 1 Autotuba...and looking for more!

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Seth
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Re: What's to chat about?

#1127 Post by Seth » Mon Nov 29, 2021 11:43 am

Failed attempt at a little humor. I know whatcha meant Rich. In all honesty, I didn't even look for any deals. Maybe I'll poke my nose in Amazon today and see if I can just get it all done in a day.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

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Bryan Cox
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Re: What's to chat about?

#1128 Post by Bryan Cox » Mon Dec 06, 2021 7:51 pm

Made a sweet purchase today. I got some NOS tubes and Sprague caps (and a bunch of other stuff I won't use). But the 12AX7 and 12AT7 tubes made it all worth it.
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Otop 12 x 4 (Delta Pro 12-450a) 2x melded, 2x straight
Titan 39 x 4 (3012LF) 20" wide

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Seth
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Re: What's to chat about?

#1129 Post by Seth » Mon Dec 06, 2021 10:15 pm

I have no/little idea what sprague caps and NOS tubes are, just assuming they're for tube amplifiers. What do you intend to do with them?
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

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Bryan Cox
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Location: Owensville, Mo

Re: What's to chat about?

#1130 Post by Bryan Cox » Tue Dec 07, 2021 5:34 am

Absolutely right, Seth. Some tube amp enthusiasts and audiophiles spend time sniffing corks while demanding that these original Sprague caps and NOS tubes are the only things that sound good. I have no idea about the caps, but I do know that NOS preamp tubes will last decades if they're in good shape. And these are the military versions so they're a bit more rugged than their civilian counterparts.

I shelled out a bit of coin for a NOS tube set up for one of my amps since it was designed around them. The hum issue I had went away immediately. If I found these before I bought the others I'd have saved $300.
Otop 12 x 4 (Delta Pro 12-450a) 2x melded, 2x straight
Titan 39 x 4 (3012LF) 20" wide

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Bryan Cox
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Re: What's to chat about?

#1131 Post by Bryan Cox » Tue Dec 07, 2021 6:05 am

Seth wrote:
Mon Dec 06, 2021 10:15 pm
I have no/little idea what sprague caps and NOS tubes are, just assuming they're for tube amplifiers. What do you intend to do with them?
Should've answered your question better...

NOS (new old stock) tubes are ones from before the transistor took over (GE, Sylvania, Shughuang, Mullard, Amperex, Telefunken, etc...). Circa 1950's - late 70's or so. Everything went to transistors almost overnight and tube factories shut down. But for the last 10 years, give or take, the tube is making a fierce comeback. Factories have been opened back up and tube production is well underway, but there is a definitive change in the quality of the tubes. New tubes are a little more fragile, cannot handle the same voltages, the vacuum doesn't seem to be quite as strong, and the sound is sometimes weaker. From my experience, many of the new tubes are too compressed (squished, even) when pushed and the tone is a little less present (to my ears, in my amps)

Production differences have no impact on amps designed around those capabilities. Some of them sound damn good. But many of the older amps, designed around the capabilities of NOS tubes, suffer when retubed with newer stuff. And this is a relatively large issue for the amp cloning community because that means they either have to pay out the nose for NOS, live with a noisy amp, or change the design to lower plate voltage and compensate for new tubes (which kind of defeats the purpose of a clone).

The old-ass Sprague caps will drive cork sniffing audiophiles crazy. So I plan to stoke the fire a little. Makes me chuckle.
Otop 12 x 4 (Delta Pro 12-450a) 2x melded, 2x straight
Titan 39 x 4 (3012LF) 20" wide

Bruce Weldy
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Re: What's to chat about?

#1132 Post by Bruce Weldy » Tue Dec 07, 2021 7:54 am

Bryan Cox wrote:
Tue Dec 07, 2021 6:05 am

NOS (new old stock) tubes are ones from before the transistor took over (GE, Sylvania, Shughuang, Mullard, Amperex, Telefunken, etc...
And to make it even simpler..... NOS stands for New Old Stock. In other words, it was built a long time ago, but hasn't been used.




Sorta' like my brain.....

6 - T39 4-25" 2-22" 3012LF
4 - OT12 2512 Melded/NSD2005
1 - T24
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

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Seth
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Re: What's to chat about?

#1133 Post by Seth » Tue Dec 07, 2021 12:42 pm

Nice! Great explanation guys. I'm familiar with the new old stock term. Guess it didn't click in my mind. I just assumed the acronym had to do with something about the tubes themselves and didn't give it anymore thought. Do you have a current use or plan for them, or are they just good parts to have on hand for you?
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

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Bryan Cox
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Location: Owensville, Mo

Re: What's to chat about?

#1134 Post by Bryan Cox » Tue Dec 07, 2021 10:10 pm

For now they're extras. Both my JMP 50 and Express are outfitted with NOS glass so I'll save them. Tube amp enthusiasts (such as myself) are kind of particular about the tubes they use. If one goes microphonic or dies, I have some on hand.

I also have a healthy supply of newer tubes. I kind of mix and match depending on the tone I'm after. For example, if I'm in a blues band I'll use something with great mids, high end sparkle and low compression. If I'm playing hard rock I want something with tight lows and sort of sterile. If a tube goes bad I have some on hand.
Otop 12 x 4 (Delta Pro 12-450a) 2x melded, 2x straight
Titan 39 x 4 (3012LF) 20" wide

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