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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 214

post #3196 of 10501

Hi Siles 1991,

 

Everything you are looking for and more you can find in a pair of box top RCA 6AV6 tubes.

post #3197 of 10501
Quote:
Originally Posted by mordy View Post
 

Hi All,

 

Some time back (page 199) I wrote that the 6DT6(A) tube makes me feel toe tapping good, and the 6AV6 tube makes me marvel at the holographic 3D super detailed sound stage with it's natural voice presentation and immediacy. Surely these two tubes are among the best we found to date (together with the 6AU6/8425 and 6AH6WA/6485 tubes.)

 

 

I do like my heptodes. The best of them are superior to the best of the 6AU6 and 6AH6 I have.

I won't comment on the 6DT6A, as it seems I haven't got the the best of them with the GE. A pair of RCAs are incoming. For the 6AV6, I have a pair of Mullard 10M 6AV6, which I really like, but I would position them close to the level of a Raytheon 6BE6W, which overall is my go-to tube at the moment.

post #3198 of 10501
Quote:
Originally Posted by mordy View Post
 

Hi Siles 1991,

 

Everything you are looking for and more you can find in a pair of box top RCA 6AV6 tubes.

 

any good deals on them at this moment?

post #3199 of 10501
Quote:
Originally Posted by gibosi View Post
 

 

Of course, without seeing them, we cannot say anything for sure. The vendor clearly states: "It is premium quality tube with Philips/Mullard tube codes." And it follows, Philips/Mullard = Blackburn. But again, until someone gets these, we can't be sure....

 

Hi gibosi - and oskari - and anyone else interested, as things seem to have gone very quiet on the 6HM5 front (no wonder, with the exciting experiments going on courtesy of AFB once again!...).

 

Anyway, my "premium quality tubes for export" arrived today and my word, they are of VERY classy construction. Yugoslavia on them, with codes that ARE Philips, but NOT Mullard...

Actually : tZ1 (= tube type PCC 85 ) and G5A (G being Loewe Opta, post-1954, and Mullard/Fleetwood prior. As 5 must be '65, we are looking at Loewe therefore - no wonder the tubes look classy...they are quite some outfit, no? And no doubt VERY picky...

 

So, popped them in; gasped at the blinding flash from their bottoms that ensued; resisted the temptation to switch everything off; calmed down as they settled to a beautiful glow, and (thankfully) was rewarded with a sound that bodes very well indeed right from the off. These would appear to have the potential to knock the lovely RCA 6DT6As off their lovely perch...time will tell...

post #3200 of 10501

I'm a bit lost here. Could you please provide a photo of the tube and the code?

post #3201 of 10501

It seems that my luck with unbroken tubes has changed. I ordered only 2 NEC 6AV6 from Taiwan and one has cracked glass right from the box. There must have been some tension in glass and temperature variation broke it. Tube has something like white flakes inside. My first broken tube ever. :( 

post #3202 of 10501
Sorry to hear that Artsi, hopefully mine don't share the same fate.
post #3203 of 10501
Quote:
Originally Posted by Artsi View Post
 

It seems that my luck with unbroken tubes has changed. I ordered only 2 NEC 6AV6 from Taiwan and one has cracked glass right from the box. There must have been some tension in glass and temperature variation broke it. Tube has something like white flakes inside. My first broken tube ever. :( 

I know the feeling, lost 2 this week... one drop and one failure... sad days...

post #3204 of 10501
Quote:
Originally Posted by kvtaco17 View Post
 

I know the feeling, lost 2 this week... one drop and one failure... sad days...

 

Time do go shopping!

post #3205 of 10501
Quote:
Originally Posted by MIKELAP View Post
 

 

Time do go shopping!

surplus tubes here are coming in handy lol

 

BUT yeah I need to buy some new ones...

post #3206 of 10501
Quote:
Originally Posted by kvtaco17 View Post
 

surplus tubes here are coming in handy lol

 

BUT yeah I need to buy some new ones...

 

Usually i try to buy 3tubes or 5 tubes because you never know i had a couple of duds also 

post #3207 of 10501
Quote:
Originally Posted by Oskari View Post
 

I'm a bit lost here. Could you please provide a photo of the tube and the code?

 

The 6HM5 tube manufactured in Yugoslavia.

 

http://www.ebay.com/itm/6HM5-6HA5-EC900-export-quality-audio-triode-tube-NOS-FREE-SHIPPING-/300879467071?pt=Vintage_Electronics_R2&hash=item460dd0523f

 

The Philips code on these tubes, G5A, seems to reference Loewe Opta. However, a quick search suggests that Loewe's production facilities were located in Kronach, Oberfranken, Bavaria, Germany. So while it seems clear that these were not manufactured in Mullard's Blackburn factory, it is still not clear where these tubes were actually manufactured..... Bavaria? or Yugoslovia?

post #3208 of 10501

Oddly enough section:

 

For the man who has everything: Here is a USB plug in vacuum tube look adapter that does the following:

  • Connects to your Computer's USB 2.0 Port and Delivers Virtual Surround Sound through your Stereo Headphones or Stereo speakers
  • LFE Mixing ? Enables Low-End Frequencies to be Mixed with Front Channels for Superior Performance
  • DTS Surround Sensation Headphone Simulates Surround Sound through Headphones with Voice Clarification Technology; Bass Enhancement; and Soundstage Expansion
  • Provides Two 3.5mm Jacks for Stereo Microphone-In and Stereo Microphone-Out

 

http://www.amazon.com/IOGEAR-Theater-Sound-Xperience-GUADT51/dp/B0058DN0C4/ref=sr_1_fkmr0_3?ie=UTF8&qid=1380686643&sr=8-3-fkmr0&keywords=6HM5+Vacuum+Tube

The main use seems to be as a substitute for a broken sound card in a lap top.31Z6XYm8AbL.jpg

post #3209 of 10501
Quote:
Originally Posted by hypnos1 View Post
 

 

Hi gibosi - and oskari - and anyone else interested, as things seem to have gone very quiet on the 6HM5 front (no wonder, with the exciting experiments going on courtesy of AFB once again!...).

 

Anyway, my "premium quality tubes for export" arrived today and my word, they are of VERY classy construction. Yugoslavia on them, with codes that ARE Philips, but NOT Mullard...

Actually : tZ1 (= tube type PCC 85 ) and G5A (G being Loewe Opta, post-1954, and Mullard/Fleetwood prior. As 5 must be '65, we are looking at Loewe therefore - no wonder the tubes look classy...they are quite some outfit, no? And no doubt VERY picky...

 

So, popped them in; gasped at the blinding flash from their bottoms that ensued; resisted the temptation to switch everything off; calmed down as they settled to a beautiful glow, and (thankfully) was rewarded with a sound that bodes very well indeed right from the off. These would appear to have the potential to knock the lovely RCA 6DT6As off their lovely perch...time will tell...

 

Quote:
Originally Posted by gibosi View Post
 

 

The 6HM5 tube manufactured in Yugoslavia.

 

http://www.ebay.com/itm/6HM5-6HA5-EC900-export-quality-audio-triode-tube-NOS-FREE-SHIPPING-/300879467071?pt=Vintage_Electronics_R2&hash=item460dd0523f

 

The Philips code on these tubes, G5A, seems to reference Loewe Opta. However, a quick search suggests that Loewe's production facilities were located in Kronach, Oberfranken, Bavaria, Germany. So while it seems clear that these were not manufactured in Mullard's Blackburn factory, it is still not clear where these tubes were actually manufactured..... Bavaria? or Yugoslovia?

 

Factory code "G", you sure? Maybe factory code:

 

 

EI, Nish factory, (ex-)Yugoslavia. The similarity with a "G" isn't that obvious here, but on the pics of real tubes I've seen and on my EI ECC88, the factory code circle is longer and more "circle-like", making it look like a 90° turned G to the untrained eye -or uninformed soul lol.

 

Factory code "G" would make little sense, whereas the EI factory is about the only Yugoslavian tube maker I know about.

 

Depending on the tube type, EI could have used Philips machinery (ECC88 for instance), Telefunken machinery (ECC83 for example) and maybe even some other production gear for all I know. These tubes, with their shape (top "nib") and codes, could have been made on ex-Philips gear. Or maybe not. If we compare it to a Mullard Blackburn or Philips Heerlen-made tube, we might be able to tell.

post #3210 of 10501

agree.I spending ~70$ on super-tubes, or am I selling the amp as it is, add another 70$ and buy the darkvoice 336 instead. 

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