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6U8 vs 6GH8 vs 6BL8 sub for 7199 needed

68.231.156.10
Posted on July 15, 2017 at 08:59:01
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 One of the 7199s in my Sherwood S-5000 finally gave it up last night. It looks like it's time to rewire the sockets to fit either a 6U8, 6GH8 or 6BL8.

Does anyone have any preference between these tubes.

 

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RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 15, 2017 at 09:44:44
DAK
Audiophile

Posts: 2712
Location: PACIFIC
Joined: August 8, 2010
 The Euro ECF80 / 6bl8 is an excellent tube. Amperex , Mullard even Telefunken made those.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 15, 2017 at 13:56:08
Alpha Al
Industry Professional

Posts: 2958
Location: N. Carolina
Joined: February 16, 2004
Contributor
  Since: December 3, 2015
 I've had good results with TungSol 6U8 (original, not reissue).

A lot of 6U8's hum from heater to cathode leakage in the pentode section, old TungSols usually do not.

There are some 7199 to 6U8 adapters available, also so you don't have to rewire.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 15, 2017 at 16:17:42
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 Rewiring is just moving three wires. Besides it looks like the 7199s are done and gone.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 15, 2017 at 17:08:42
Eli Duttman
Audiophile

Posts: 10455
Location: Monroe Township, NJ
Joined: March 31, 2000
 Yes, the 7199 has gone the way of the Dodo.

If you check Scott amp circuits, you will find that any of the 3 types mentioned will definitely do. FWIW, I have reasons to prefer the 6BL8.

An old story here on AA applies. Talk to Jim McShane and get nice tubes that will work.


Eli D.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 15, 2017 at 18:10:44
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 Thanks Eli. I trust both your opinion and Jim's

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 16, 2017 at 00:19:03
Nunki
Audiophile

Posts: 644
Joined: November 27, 2010
 i have a flock of TFK, Valvo or Siemens NOS ECF80/E80CF
drop me a message if you need one...

Nunki


 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 16, 2017 at 07:15:09
fredtr
Audiophile

Posts: 1987
Location: Phoenix
Joined: January 4, 2005
 If you are interested in a stop gap, there is a guy here in Phoenix that probably has some 7199's.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 16, 2017 at 07:46:07
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 I'm just figuring that the 7199s are pretty much a dead issue. I REALLY like my Sherwood and the 7199s have always had an iffy tone in debates over sound. I figure this is a good opportunity to MAYBE move it up a notch to a 6BL8.

This Sherwood is kind of special to me. I can rewiring the socket which will allow me to roll and tweak a few other tubes. Where as with the 7199s you're kind of stuck.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 16, 2017 at 08:19:28
fredtr
Audiophile

Posts: 1987
Location: Phoenix
Joined: January 4, 2005
 Please post your impressions with the conversion. I have an S-5000, that I would like to improve if possible.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 16, 2017 at 18:20:03
PakProtector
Audiophile

Posts: 12364
Joined: May 14, 2002
 7199 are not so rare as to be worth the trouble for another pentode/triode tube to stick in a single socket. Now if an EF184 and 6SN7 section are up for discussion...or maybe a 12HL7 and a 12A4...LOL
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 16, 2017 at 19:44:11
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 Like I told Mike S when he rebuilt my Sherwood,"just weld the cover screws on because I never want to see the inside of this stereo".

A few simple wire swaps I can handle. Reinventing the entire circuit - ain't gonna happen!

I love this Sherwood Just the way it is/was so the 6BL8s are close enough.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 17, 2017 at 05:46:45
Triode_Kingdom
Audiophile

Posts: 10047
Location: Central Texas
Joined: September 24, 2006
 The 7199 seems to be available on eBay at $30-50 each or so. It's foolish to rewire the sockets and switch to a less linear tube type for this cost. The replacement will last a long time.





 

7199, posted on July 18, 2017 at 01:38:16
FenderLover
 I stocked up on NOS Sylvania and RCA 7199 tubes, years ago. Very hard to find adequate subs, for those amps that take these.

I'm glad NOS or ANOS have dropped back to around $50-75, each. Prices were around $100 each for legit NOS... just 5-10 years ago.

Someone, must have found a hidden treasure box!


8^)

 

RE: 7199, posted on July 18, 2017 at 06:39:45
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 I decided to rewire the socket for 6U8 types but I'm buying a Amperex gold pin E80CF/7643.

Let me tell ya, as I was starting rewiring that socket out in the Arizona heat I WOULD have paid any price just to replace those tubes. But the job is done and the 7643s are on their way.

 

LOL...:), posted on July 18, 2017 at 13:42:37
PakProtector
Audiophile

Posts: 12364
Joined: May 14, 2002
 Arizona July heat would have had my CC out before the soldering was warm...or I would have carved it up to run something better by a long shot.
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 18, 2017 at 14:26:43
tubular.well
Dealer

Posts: 223
Joined: March 4, 2013
 I still have some fresh 7199. But i also experienced that some
recent purchases is of questionable value, i've seen old pulls sold
as "NOS" and i have got noisy ones.

I'm reluctant to sell the bad 7199 i got from ebay, i think i have to
scrap them. I guess that's why they were so cheap. Watch out for such
tubes!, go for GB-1252 och 6u8/ECF82 instead and invest in rewiring the sockets.

 

But it's a dry heat... (nt), posted on July 18, 2017 at 20:01:33
Triode_Kingdom
Audiophile

Posts: 10047
Location: Central Texas
Joined: September 24, 2006
 nada aqui





 

RE: But it's a dry heat... (nt), posted on July 18, 2017 at 21:00:50
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 Not during monsoon season

 

RE: But it's a dry heat... (nt), posted on July 19, 2017 at 05:19:01
PakProtector
Audiophile

Posts: 12364
Joined: May 14, 2002
 That just means you fall over dead in relative comfort...LOL
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

 

RE: 6U8 vs 6GH8 vs 6BL8 sub for 7199 needed, posted on July 19, 2017 at 22:42:04
DannyR
Audiophile

Posts: 611
Joined: January 21, 2001
 Charles, there are some for sale on audioasylum trader for a okay price. 35 a pop. they should last years. I'm guessing the ones that wore on you had tons of use. Just grab em and worry about the rewire etc down the road if need be.

 

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