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New Millett Hybrid MiniMAX (what happened to this thread?) - Page 130

post #1936 of 1944
Quote:
Originally Posted by dentaku81 View Post
 

Awesome, im currently building a cmoy to re-learn how to solder, but i will start on the minimax after that.

Sounds like a good plan. ;)

post #1937 of 1944
Will HE500 and LCD2 sounds good with miniMax? Right now I paired them with EF5. Will miniMax gives a significant improvement over EF5? Thanks
post #1938 of 1944
Quote:
Originally Posted by wewewho77 View Post

Will HE500 and LCD2 sounds good with miniMax? Right now I paired them with EF5. Will miniMax gives a significant improvement over EF5? Thanks

Typically, I don't like direct comparisons in the DIY forum section.  We're not really trying to compete against commercial products.

 

What I will tell you - I know nothing about the EF-5 except photos, etc. - is that I am not a fan of single-tube stereo amplifiers.  In my years of testing and matching literally thousands of tubes, the incidence of dual-triode tubes where the triodes are matched is very low.  I'd say one in 20 or 30, probably.  If the triodes are unmatched, you can balance the channels, but the stronger triode will always pump more output with transients, etc.*

 

* With two-tube amps using dual-triode tubes, the triodes of each tube are typically connected in parallel.  That averages the output.  You can have one tube measuring 120/80 and another at 105/95 - theoretically, they are matched because they each average to 100.  It exponentially increases your chances of matching the tubes' output in the amp.


Edited by tomb - 10/24/13 at 3:40pm
post #1939 of 1944
Sorry tom I didn't mean disrespect to anybody here. I used to be sceptical about tubes for their noise issue, old technology etc. But I also realize that tubes has so many faithful fans out there. I thought there's must be something special about them. So I decided to buy this EF5 amplifier for my HE500. And then I finally can understand why so many people loooves the sound of tubes. And my EF5 is so small but sounds so nice to my ears. I wonder if a bigger tube amps will take my setup to a much higher level. I asked around and someone very experienced DIYer suggested to try SSMH or miniMax if I want to have a big step up from my current setup. He said these amps are a steal for their price. So I just want to know your opinion here guys. Maybe I just send you PM than ask in this thread about the comparison between them. I really appreciate your information. Thanks
post #1940 of 1944
Quote:
Originally Posted by wewewho77 View Post

Sorry tom I didn't mean disrespect to anybody here. I used to be sceptical about tubes for their noise issue, old technology etc. But I also realize that tubes has so many faithful fans out there. I thought there's must be something special about them. So I decided to buy this EF5 amplifier for my HE500. And then I finally can understand why so many people loooves the sound of tubes. And my EF5 is so small but sounds so nice to my ears. I wonder if a bigger tube amps will take my setup to a much higher level. I asked around and someone very experienced DIYer suggested to try SSMH or miniMax if I want to have a big step up from my current setup. He said these amps are a steal for their price. So I just want to know your opinion here guys. Maybe I just send you PM than ask in this thread about the comparison between them. I really appreciate your information. Thanks

No disrespect was felt. :)

 

It's a perfectly natural question, but probably best asked in the Head-Fi Amplifier section.  No one's going to object to sound quality comparisons, there.  It's just that DIY - in my opinion - is about offering do-it-yourself designs and support.  (This is the MiniMAX support thread, for instance.)  We're not even trying to compete against each other with most designs.  Most of us, even if we're MOT's, are running on shoestring budgets and do this because of our love of the hobby.  Yes, I'd be untruthful if I didn't say economics plays a large part, but that's simply the reality of buying, selling, and the required investments to do that on a regular basis.

 

Anyway - it's just my opinion and one I try to adhere to.  As I said, no one's going to object to you asking any sort of comparison question over in the Amplifier section.  Besides reviews, that's the almost the whole purpose of that section.

 

There's a comparison review on Head-Fi, but I think he had some dud tubes, or else didn't re-bias with tube changes.;)  The MiniMAX was also sold as a fully-built product by Whiplash Audio for awhile, too.  I believe there are several reviews of the Whiplash Audio MiniMAX on Head-Fi.  The MiniMAX has been around for quite awhile - just google "Millett Hybrid MiniMAX review" and you'll find a bunch - even some youtube videos like this one: http://www.youtube.com/watch?v=kQtTv1qI1Yc


Edited by tomb - 10/25/13 at 7:00am
post #1941 of 1944

Hi all,

 

I was wondering if I may have a hand in troubleshooting my MiniMax.

 

It's been going strong for quite a couple of years now, but unfortunately as I did not use a case for it, dust gathered and the blue smoke escaped.

 

At first i thought the problem was isolated around the burnt QM1 which I've replaced, found out DM1 was open circuit, so replaced that as well. Fuse was a gone as well. I've then verified that the relay now successfully trips and that both relay output coils are switching. TA2L- Gnd/ TA2R-Gnd and TA2L-TB1L/ TA2R-TB2R are biased still correctly.

 

I'm not really where to go from here. Could anyone recommend any other pads i should be testing?

 

Cheers,

Bismar

post #1942 of 1944
Quote:
Originally Posted by Bismar View Post
 

Hi all,

 

I was wondering if I may have a hand in troubleshooting my MiniMax.

 

It's been going strong for quite a couple of years now, but unfortunately as I did not use a case for it, dust gathered and the blue smoke escaped.

 

At first i thought the problem was isolated around the burnt QM1 which I've replaced, found out DM1 was open circuit, so replaced that as well. Fuse was a gone as well. I've then verified that the relay now successfully trips and that both relay output coils are switching. TA2L- Gnd/ TA2R-Gnd and TA2L-TB1L/ TA2R-TB2R are biased still correctly.

 

I'm not really where to go from here. Could anyone recommend any other pads i should be testing?

 

Cheers,

Bismar

Questions:

  • If those points are biased correctly, does that mean that the amp turns on, but you get no sound?
  • What is the voltage setting?
  • Are you using the proper adapter (24VAC)?
  • How about the tubes - have you tried swapping them out?

 

I'm not sure I see the issue from your description.  If the bias points are correct and you can tell that the relay switches in, you should get sound unless the tubes are blown.  Maybe you have a shorted tube?  Just as a check, can you give us the exact readings from your bias points?

post #1943 of 1944
Quote:
Originally Posted by tomb View Post
 

Questions:

  • If those points are biased correctly, does that mean that the amp turns on, but you get no sound?
  • What is the voltage setting?
  • Are you using the proper adapter (24VAC)?
  • How about the tubes - have you tried swapping them out?

 

I'm not sure I see the issue from your description.  If the bias points are correct and you can tell that the relay switches in, you should get sound unless the tubes are blown.  Maybe you have a shorted tube?  Just as a check, can you give us the exact readings from your bias points?

 

tomb,

 

Thanks very much for your help, you solved it! 

 

Its been so long that one pair of tubes has blown I did not honestly think about even swapping them out. Turns out both my previous tubes must have blown in the short.

 

Its such a huge difference being able to use this amp again!

post #1944 of 1944
Quote:
Originally Posted by Bismar View Post
 

 

tomb,

 

Thanks very much for your help, you solved it!

 

Its been so long that one pair of tubes has blown I did not honestly think about even swapping them out. Turns out both my previous tubes must have blown in the short.

 

Its such a huge difference being able to use this amp again!

 

Glad you got it fixed! :)

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