or Connect
New Posts  All Forums:Forum Nav:

For 6AS7G tube rollers here ..... - Page 82

post #1216 of 3799

Does anyone know what the deal is with lopsided tubes? I get the minor differences, but some seem pretty extreme.  Wondering if something like this is still considered normal.

 

post #1217 of 3799

Hi,

  anybody familiar with these Brand/make? please refer to the pictures below.Thank You!

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90

 

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90

post #1218 of 3799

They look like rebrand of Chatham.  Good tubes.

post #1219 of 3799
Yup, sure looks like Tung-Sol/Chatham to me.
post #1220 of 3799
Quote:
Originally Posted by Neogeo333 View Post
 

They look like rebrand of Chatham.  Good tubes.

 

 

Quote:
Originally Posted by Skylab View Post

Yup, sure looks like Tung-Sol/Chatham to me.

Thank You!But they are sold i waited too long.....:(

post #1221 of 3799
I recently purchased a pair of GEC 6AS7G curved brown base tubes from a trustworthy eBay seller. To my joy they arrived yesterday.

Unfortunately one of them is behaving a little peculiarly. Shortly after turning on (about thirty seconds) it emits a loud crackling sound through my headphones, which I haven't put on by this stage. A couple of minutes later it crackles again (very loud) and the left channel drops out.

Can anyone suggest the reason for this? I would only return it as a last resort as I dearly love the sound of this tube when it is working,
post #1222 of 3799
Quote:
Originally Posted by MoatsArt View Post

I recently purchased a pair of GEC 6AS7G curved brown base tubes from a trustworthy eBay seller. To my joy they arrived yesterday.

Unfortunately one of them is behaving a little peculiarly. Shortly after turning on (about thirty seconds) it emits a loud crackling sound through my headphones, which I haven't put on by this stage. A couple of minutes later it crackles again (very loud) and the left channel drops out.

Can anyone suggest the reason for this? I would only return it as a last resort as I dearly love the sound of this tube when it is working,

 

Nathan have you tried it with a different input tube I know you run the E80cc does it behave the same with the 12au7? The only tubes I have experienced something similar with are the Bendix 6080 graphite plates and they only did it a few times on start up soon after shipping. Once I had put a few hours on them they settled down and the problem went away.

 

I use a old set of cheap old phones for any initial testing be it new tubes, burning in caps or after making circuit mods.

post #1223 of 3799
Quote:
Originally Posted by MoatsArt View Post

I recently purchased a pair of GEC 6AS7G curved brown base tubes from a trustworthy eBay seller. To my joy they arrived yesterday.

Unfortunately one of them is behaving a little peculiarly. Shortly after turning on (about thirty seconds) it emits a loud crackling sound through my headphones, which I haven't put on by this stage. A couple of minutes later it crackles again (very loud) and the left channel drops out.

Can anyone suggest the reason for this? I would only return it as a last resort as I dearly love the sound of this tube when it is working,

 

Sounds defective to me. Cold, the tube seems to work, but as it heats up to operating temperature, internal metal parts expand, something inside shifts position slightly and the left channel drops out. These are wonderful tubes and you have my condolences...

post #1224 of 3799
One other suggestion...with the amp off and cool of course, try re-seating the tube. The problem you describe can sometimes be due to a poor contact in the tube socket. Make sure that you see both filaments glowing. Then as others have suggested, with the volume all the way down and without valuable headphones connected, let it run for a good while.

If after all that it doesn't seem to be working, do contact the seller, who I happen to know has a 100% customer satisfaction policy wink.gif
post #1225 of 3799

If the seller offered a warranty then I'd inform him and return it as soon as my feet could scurry to the post office.  Bummer for both parties involved of course but given the price these typically sell for you have the right to expect a functioning tube if it was sold as such.  Assuming the amp and cans work fine with any other tubes of the same basic construction I guess that thermal expansion makes something shift and lose contact, this clearly goes beyond 'pinging' tubes during warmup.  Good tip to check the heaters.

post #1226 of 3799

Hi,

  Anyone familiar with this site Westubes.com?Thanks!

 
post #1227 of 3799

Just a short side note to share my excitement about one of the new tube types  I'm currently testing in my DV 337 amp:  a pair of Sylvania 7236 power tubes.  To my ears these sound extraordinarily good.  I'll definitely do a more detailed comparison later on but some impressions while listening to classical on the 337 and paired with TS 6SJ7 mesh plate drivers:  

 

- Extraordinarily clear and crisp sounding, much clearer than any 6080 and 6AS7(G) I've heard.

- Very detailed

- Deep soundstage

- Dead silent, no microphonics at all on this NOS pair, and this from the first moment.

 

I'd compare them to my TS 5998 but a bit less 'wide' in soundstage, though deeper and more detailed.  Bass is good, not very pronounced (caution:  the type of music I'm listening to right now is not bet for bass let alone bass punch evaluation), less 'boomy' than the TS 5998.

 

These are not warm sounding tubes, rather more SS like to my ears but very, very detailed and really nice with orchestral music and brass (listening to some trumpet concertos by Purcell, extraordinary). 

 

You don't see these too often online but even at this stage I'd say, grab a pair if you encounter them.  Best of all, I paid less than half than the price for 5998.

 

As always, everything 'IMO' and based on my taste.

post #1228 of 3799
Thanks for the observations. Tung Sol 7236 is one of my favourite 6AS7G "swap ins". Tight and fast bass, great resolution. Be interested in comparing with Sylvania 7236.

Can you describe the plate structure? Is it like an RCA 6AS7G in a straight bottle, or a light grey box structure? The latter is the mark of Tung Sol manufacture, but I have seen them labelled by Sylvania, even as 5998A.
Edited by MoatsArt - 5/24/14 at 6:39am
post #1229 of 3799
Quote:
Originally Posted by MoatsArt View Post

Thanks for the observations. Tung Sol 7236 is one of my favourite 6AS7G "swap ins". Tight and fast bass, great resolution. Be interested in comparing with Sylvania 7236.

Can you describe the plate structure? Is it like an RCA 6AS7G in a straight bottle, or a light grey box structure? The latter is the mark of Tung Sol manufacture, but I have seen them labelled by Sylvania, even as 5998A.

 

The Sylvania 7236 has a flat plate structure like a 6AS7G.  It sounds pretty good, but it's nowhere near as good as the TS7236. 

post #1230 of 3799

Here's a quick pic of the Sylvania 7236 playing in my amp, don't know if it helps you for the structure.  Apologies for quality but hey, it's 5:30 AM here :-)

 

Once again, I haven't heard the TS version but these do sound very, very nice if you like a tight, clear, controlled and not overly warm sound that most would term more ss than tubey.  Have just been rolling them to compare with RCA 6AS7G and for my taste the 7236 play in a different and far superior league when listening to classical.  Have BWV 1068 on (Bach's suite Nr. 3  in D for orchestra) and it's magic.  But remember my caveats about bass (haven't tested them with it yet) and the fact that I'm really a fence-sitter and prefer a warm SS sound or a cool-neutral sounding tube amp, not the favoured by many 'lush' or 'liquid' / warm tube sound.  Will do a detailed comparison with the TS 5998 later, wouldn't surprise me if these came out on top for me.

New Posts  All Forums:Forum Nav: