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Little Dot MK VI / Little Dot MK VIII SE Owners Unite - Page 72

post #1066 of 1335
Quote:
Originally Posted by G600 View Post
 

Yep, there's this seller, who's offering 175 USD per Bendix... :D

I didn't say it was going to be easy...... we've all been through this....  It's a crazy world!

post #1067 of 1335

Indeed !

But those offers are some kind of fun.

post #1068 of 1335

Good to see this amp getting some love.

 

With ventilation and if it is concern with you with the fans being inadequate and noise being an annoyance, you can remove the bottom metal plate, have afixed feets to the sides of the case and have it on a plinth of some sort, lots of ventilation much more than the fans upgraded or not.

post #1069 of 1335

Out of curiosity I picked up a pair of Sophia Electric 6SN7 tubes...  Grade B, unused, for $99.  These are the 4th pair of drivers tubes I've bought.  Tung-Sol 6SL7GT, EH 6SN7 and RCA 6SN7GT black plates circa 1953 are the other three.  The Sophia tubes don't have as much gain as the other three (have to crank the dial up to 90 instead of 70), but so far they're at the top of the list and definitely the most 'tubey' sound out of them all.

 

post #1070 of 1335

The Sophia 6SN7's are pretty bad value for the money definitely not worth it considering a RCA 6SN7 coin base or Sylvania bad boy can be found for less then $30 and are damn good.

 

Don't get me wrong I'm not dissing the Sophia Electric stuff, I had quad (now a pair) of there grade A 12AU7 and a pair of there best 300B (very $$) and consider them among the best of it's tube family easily on par with the $400 12AU7's I've tried and stuff.

 

Try some Psvanes as well they are again amongst the best I've tried.


Edited by DefQon - 1/17/14 at 1:21am
post #1071 of 1335

Isn't the Sophia 6sn7 (and 300b for that matter) just TJ full music rebranded?

post #1072 of 1335
Quote:
Originally Posted by khaine1711 View Post
 

Isn't the Sophia 6sn7 (and 300b for that matter) just TJ full music rebranded?

Yes for the first and yes/no for the second depending on the grade you buy. I think Skylab mentioned it as well for the 6SN7 but the actual manufacturer for TJ is unknown and definitely not Shuguang or from the Beijing factory plants as I have asked few of my overseas contacts that know more about these tubes than anybody on this forum.

 

Not that rebrand's are any bad, Mullard, Amperex etc did it back in the day as well. Fakes and imitations is another story.


Edited by DefQon - 1/17/14 at 1:33am
post #1073 of 1335

Yea rebrand is fine - I have a few rebrand tube in my nest. However, rebrand with increase cost is meh - not sure how it is in the States but in the UK, Sophia 6sn7 is like 50% more expensive than TJ 6sn7. Just curious DefQon, have you tried the 5692 (RCA and CBS) in your Mk6?

post #1074 of 1335
Quote:
Originally Posted by khaine1711 View Post
 

Yea rebrand is fine - I have a few rebrand tube in my nest. However, rebrand with increase cost is meh - not sure how it is in the States but in the UK, Sophia 6sn7 is like 50% more expensive than TJ 6sn7. Just curious DefQon, have you tried the 5692 (RCA and CBS) in your Mk6?


Haven't tried the 5692 with the MK6 as my current stash of 6SN7's is plenty maybe I will get a 5692 maybe in the future. I really want an EL84/KT66 or 88 based amp (both not in the same amp), but only because I've got over tons of quad 6BQ5/6P14/EL84's lying around. Wouldn't mind a 6DJ8 for input or drive and some FU32's for power that'd be awesome but those tubes are microphonic as schit.

 

Heck I wouldn't mind LD doing a tube amp using some mercury gas filled tubes for the blue glow and a proper 6X4 based rectification in a regulated PS.

post #1075 of 1335
Quote:
Originally Posted by DefQon View Post
 


Haven't tried the 5692 with the MK6 as my current stash of 6SN7's is plenty maybe I will get a 5692 maybe in the future. I really want an EL84/KT66 or 88 based amp (both not in the same amp), but only because I've got over tons of quad 6BQ5/6P14/EL84's lying around. Wouldn't mind a 6DJ8 for input or drive and some FU32's for power that'd be awesome but those tubes are microphonic as schit.

 

Heck I wouldn't mind LD doing a tube amp using some mercury gas filled tubes for the blue glow and a proper 6X4 based rectification in a regulated PS.

Might as well sell life insurance bundled with that if they still put it in the Mk6 chassis :D

 

Your previousx2 post got me thinking. You think the Mk6 can survive bottomless, no fan, on top of a chair with the seating part removed (similar to a cage with no net) in the summer?

post #1076 of 1335
Quote:
Originally Posted by khaine1711 View Post
 

Yea rebrand is fine - I have a few rebrand tube in my nest. However, rebrand with increase cost is meh - not sure how it is in the States but in the UK, Sophia 6sn7 is like 50% more expensive than TJ 6sn7. Just curious DefQon, have you tried the 5692 (RCA and CBS) in your Mk6?

For what it's worth, and I haven't tried the 5692's, I suspect that they are overhyped. The reason being that some rave about them while others do not. I've tried the RCA 6SN7GT gray glass which are similarly subect to almost godlike devotion and found them very disappointing. Yes they are quite musical and sweet sounding but you pay for this in loss of detail. It's like an old tube sound, warm and cosy. Admittedly these early types are quite variable but I've tried several, all with the same results. My feeling is that if people have paid a fortune for new tubes then they are not going to admit to themselves that they've been had!!

post #1077 of 1335

Studying the circuit again, thinking once more on upgrades... I noticed 4 OP Amps (Burr-Brown OPA445AP).

Does anybody know what are they for ? I don't see any rolling to do there, but don't know their purpose here.

post #1078 of 1335
Quote:
Originally Posted by G600 View Post
 

Studying the circuit again, thinking once more on upgrades... I noticed 4 OP Amps (Burr-Brown OPA445AP).

Does anybody know what are they for ? I don't see any rolling to do there, but don't know their purpose here.

They are used for DC servo control. Since the LD VI+ do not use output caps there has to be a way of reducing the DC at the outputs. Yes they are quite important and not much in the way of rolling available.

post #1079 of 1335
Quote:
Originally Posted by khaine1711 View Post
 

Might as well sell life insurance bundled with that if they still put it in the Mk6 chassis :D

 

Your previousx2 post got me thinking. You think the Mk6 can survive bottomless, no fan, on top of a chair with the seating part removed (similar to a cage with no net) in the summer?

Some of Frank Cooter's creation use mercury gas filled tubes.

 

Some eye candy:

 

 

I'm a sucker for colourful tubes.

 

As with my point about removing the bottom plate yep sure works did it with MK6 while it was in one piece.

 

Here is an example of concept that I'm talking about to combat heat, maintaining circulated ventilation and maintaining longetivity of the components in there.

 

 

 

 

 

Quote:
Originally Posted by baronbeehive View Post
 

For what it's worth, and I haven't tried the 5692's, I suspect that they are overhyped. The reason being that some rave about them while others do not. I've tried the RCA 6SN7GT gray glass which are similarly subect to almost godlike devotion and found them very disappointing. 

As long as you get it for free or cheap it's not overhype then :D.

 

I have one of those RCA grey glass 6SN7 and also found them disappointing with a lot of the amp's (that take 6SN7) and alot of headphones driven by those amps. I found the sound to be sluggish sounding like waking up 6am on a Saturday or Sunday morning, the aspects of sound treble and especially upper mids was not coherent with the rest of the sound spectrum especially the muddled sounding low-end. I do however like them in a $12k preamp I tried while ago.

 

Quote:
Originally Posted by G600 View Post
 

Studying the circuit again, thinking once more on upgrades... I noticed 4 OP Amps (Burr-Brown OPA445AP).

Does anybody know what are they for ? I don't see any rolling to do there, but don't know their purpose here.

 

See below:

Quote:
Originally Posted by john57 View Post
 

They are used for DC servo control. Since the LD VI+ do not use output caps there has to be a way of reducing the DC at the outputs. Yes they are quite important and not much in the way of rolling available.

John is bang on the money with what they do if anything avoid rolling those opamp's because they are outside the signal path and are chosen based on measured specs with what it does in the circuit of the MK6 i.e don't touch them unless it's borked.

post #1080 of 1335

Yep, removing the bottom looks like a worthwhile mod, it would be easier to clean as well. I try to vacuum up the dust using a nozzle pointed at the air holes in the top atm! Don't want this little gem to conk out just yet.

You wake up at 6am on sundays :confused_face(1):. Apart from that that's exactly how I would describe the sound of the gray glass RCA's, pretty weird but very laid back, they might suit very aggressive sounding amps possibly. From what I've heard that sound may be how to describe the 5692's as well. You're quite right about the synergy though. I recently read a review about a great value chinese amp that most reviews have been rather unkind about but when paired with very high end outputs, instead of the rather more basic kit, it was rated higher than ultra high end kit. This was because it was just allowed to concentrate on the basics while the outputs took a lot of the load off the amp, allowing it to do what it does best.

 

Unfortunately for G600 there don't appear to be any cheap Bendixes around now, it wasn't that long ago I paid less for a quad than what he was quoted for one! I just hope people don't go round searching out reviews for the latest tube gear, then hyping them to fever pitch etc etc........ you know the rest.

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