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Darkvoice 336 + 336i Tuberolling [ tubes ]
May 27, 2009 at 1:07 PM Post #1,306 of 1,556
Those short-bottle, halo-getter, offset T-plates are generally indicative of much later than 1956, aren't they? I have some like that I'm pretty sure are from the late 60's or early 70's. They sound pretty good, yes, although I prefer the earlier Sylvanias that are tall-bottle, bottom getter, and have the regular t-plates (not offset).
 
May 27, 2009 at 2:21 PM Post #1,307 of 1,556
Quote:

Originally Posted by Skylab /img/forum/go_quote.gif
Those short-bottle, halo-getter, offset T-plates are generally indicative of much later than 1956, aren't they?


That 1956 was in reference to this. Don't you agree?
 
May 27, 2009 at 4:11 PM Post #1,308 of 1,556
Yeah I was talking about the tubes in the post immediately above mine.
 
May 27, 2009 at 7:53 PM Post #1,309 of 1,556
Oskari & Skylab,

thanks for the posts. that's very interesting! i didn't think the numbers would go from top to bottom on a U.S. product.

attached is a picture of the rest of my Sylvania collection. you can see the variations of the code formats. i've also tried to photograph the codes on the chrome tops, but it's just difficult with the reflections.

(from left to right)

the first one is a 6SN7 GT H2B; 313 (top-down). 13th week of 53? notice this one has almost half of the glass covered.

the second one is a 6SN7 GTB E6B. 981/639 (top-down).

the third one is a 6SN7 GTA E3B. 339 (left-right). 39th week of 53. notice this one has a taller bottom/base.

the last one is 6SN7 GTB H6B. "CM" as the code on the base. the text is yellow.

both Sylvania tubes that have been used are perfectly quiet in my 336i as well.
smile_phones.gif


will start a GE run next week.
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May 27, 2009 at 10:28 PM Post #1,310 of 1,556
Here are two younger Sylvanias for comparison. The left one is a 6SN7GTB (code ANU) and the right one is a GB-6SN7WGT (codes HF and SBV). The gold brand tube may look dirty but it is actually covered in a thin layer of storage grease!

 
May 28, 2009 at 12:26 AM Post #1,311 of 1,556
Right - those are more recent vintage.
 
May 31, 2009 at 6:17 AM Post #1,312 of 1,556
Wow, I can't believe I actually finished reading this thread finally. Thanks for all the input everyone. I got my DV 336se a couple months ago, and I haven't really had that much time to do research on tuberolling, but it's time to replace these stock tubes.

I like Pataburds's and Skylab's suggestions of getting the following tubes:
• RCA 6SN7GT gray
• Sylvania 6SN7GTB
• RCA 6AS7G gray
• Sylvania 6AS7G
• Tung-sol 5998 with Tung-sol tall-bottle 6SN7GTB

I don't need to get all of them right away, but I was wondering if I could get some advice on buying these tubes or if some members are willing to sell me any of these tubes. Are there any good sites I should monitor for competitive prices besides ebay? Tubeworld looks promising since it has a huge stock, but I'm not sure about its prices; thetubestore looks good too. Also, is it safe to buy used for these tubes, or is it better to go with NOS?
 
May 31, 2009 at 2:12 PM Post #1,313 of 1,556
Tubeworld tends to be on the VERY high side for tubes. Some I have bought from with great success are Antique Electronic Supply and Vacuum Tubes Radio Tubes - 5,000 different tubes in stock - Over 10 million tubes! . AES has GREAT prices on 6AS7G's, and they sell pretty much exclusively RCA's. If you call you can usually get them to tell you brand and type available, and then it might make sense to get the 6SN7 from them too. I have been able to do the same via email from the vacuumtubes.net guys.
 
May 31, 2009 at 4:20 PM Post #1,314 of 1,556
Quote:

Originally Posted by Skylab /img/forum/go_quote.gif
Tubeworld tends to be on the VERY high side for tubes. Some I have bought from with great success are Antique Electronic Supply and Vacuum Tubes Radio Tubes - 5,000 different tubes in stock - Over 10 million tubes! . AES has GREAT prices on 6AS7G's, and they sell pretty much exclusively RCA's. If you call you can usually get them to tell you brand and type available, and then it might make sense to get the 6SN7 from them too. I have been able to do the same via email from the vacuumtubes.net guys.


Thanks Skylab, I had a suspicion that Tubeworld's prices were a bit inflated. I'll check with those two dealers that you mentioned.
 
May 31, 2009 at 6:08 PM Post #1,315 of 1,556
a few comments on gray glass bottles:

It's commonly called smoked glass which is a graphite coating on the inside surface of the glass bulb. Its purpose was to "drain excess accumulations of electrons that could affect the operation of the tube". It is said that the later iterations used a different type of glass that was not prone to electron accumulation.

I have used RCA gray and clear glass tubes with identical plate construction. The sound is identical. Save some $$ by grabbing the clear glass type if you find those.

The Sylv 6SN7's are also great sounding
 
Jun 1, 2009 at 9:11 PM Post #1,316 of 1,556
I need some really thick syrupy tubes for my 336se. Have RCA 6080's and 6as7's and sylvania silver top 6sn7gta's, and hytron 6sn7gta's. I have my rig hooked up to a Synergistic Research QLS 9 powerstrip. The strip sounds great but lost the bass somewhere? We can talk how great this thing is another day. I'm hoping it is just a passing phase with break-in? Anyhow what direction should I go in with the tubes?
 
Jun 1, 2009 at 9:32 PM Post #1,317 of 1,556
OK what you need is an RCA grey-glass 6SN7GT. Use that with a grey-plate RCA 6AS7G, and that is as syrupy as you can get with the 336SE, IMO/E.
 
Jun 1, 2009 at 9:34 PM Post #1,318 of 1,556
Oskari,
your Sylvanias do look younger. mine have that 50's feel.

this week, starting the GE run. the first one is a 6SN7GTA (the first one from the left.) i suppose the "188-5" is a factory code? three of them have it. the other one says 188-4.

that leaves "4-09" as the date code? the 9th week of 54?

oh, this one hums in the beginning. after about 45 minutes it went away.
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Jun 1, 2009 at 9:39 PM Post #1,319 of 1,556
Thanks for the heads up Skylab. Yeah I noticed a little more bass and that warm tube sound when I got the RCA 6AS7 today. Just wanted to make sure before buying more tubes. You can never have too many tubes Right?
 
Jun 1, 2009 at 9:57 PM Post #1,320 of 1,556
Quote:

Originally Posted by shiaokun /img/forum/go_quote.gif

oh, this one hums in the beginning. after about 45 minutes it went away.
smily_headphones1.gif



This is not so unusual for NOS tubes.

Quote:

Originally Posted by BIG POPPA /img/forum/go_quote.gif
You can never have too many tubes Right?


THAT'S for sure.
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