[PFKMan23]

With tube amps, some transformers just hum (and some don't). There really isn't any rhyme or reason to it (assuming that it's not something like a ground loop or anything like that). It has nothing to do with the native voltage.

 

[penguindude]

Quote:

Originally Posted by PFKMan23 /img/forum/go_quote.gif With tube amps, some transformers just hum (and some don't). There really isn't any rhyme or reason to it (assuming that it's not something like a ground loop or anything like that). It has nothing to do with the native voltage.

That's good to know. It is not ground loop so it might just be a tube transformer hum, depending on where it is place. I have noticed that when the amp is placed behind me and lower to the ground, the hum level reduces.

 

[Andrew_WOT]

Quote:

Originally Posted by compuryan /img/forum/go_quote.gif I am so happy to hear such a good review of this amp because... I am getting one!

With all these problems reported?

 

[cafe zeenuts]

Quote:

Originally Posted by Andrew_WOT /img/forum/go_quote.gif With all these problems reported?

You making it sound like this amp is really flawed!

Btw, no "problems" on my end!

YMMV!!!

 

[Pricklely Peete]

Pengy,

Nice job on the write up. There is a simple adjustment you could make to possibly reduce the transformers mechanical hum, the constant 128V we get here in the GTA region can induce mechanical noise in some transformers. It's a hit or miss proposition it would seem (some amps have the noise while others don't).

Take the cover off the transformer that's making the noise. (Make sure the amp has been off for some time and unplugged before doing this). Look to see if the bolt holding the transformer is tight number 1 and number 2 if it has a damper cushion between it and the chassis top. If there is a fairly thick rubber damper than I suggest checking the nut to see if it's tight enough. One solution could be adding another rubber mat between it and the top plate then making sure that nut is good and tight and or tightening the nut a quarter turn past what it was at before you accessed the transformer can.

It's a easy process to try out and may just cure some (or even all) of the mechanical noise.

Did you buy the MK VI or are you just reviewing it ?

Peete.

 

[musicmind]

Nice writeup penguindude, thanks for the review.

 

[juzmister]

I think i'm going to be keeping my Little Dot for a second rig

Going to evaluate it with another source

 

[Fr_eak]

Nice review!

Does anyone know how does this LD6 drive the AKG K1000?

 

[juzmister]

probably quite well...just need to up the gain

 

[jamato8]

What tubes does this amp use?

 

[musicmind]

The stock tubes are JAN Slyvania 6080wc and OTK 6H9C.

I think the 6H9c is the Russian version of 6SL7.

 

[cafe zeenuts]

This amp can use 6080/6AS7/G & 5998 power tubes and 6SL7 driver tubes!

 

[minivan]

Quote:

Originally Posted by Fr_eak /img/forum/go_quote.gif Nice review! Does anyone know how does this LD6 drive the AKG K1000?

if u look at some of the posts on erji.net, u can see that the amp is built specificly for the k1000 in mind,that's why it has the 4 pin xlr output at the front. all the testing is done using the k1000 and hd650.

 

[penguindude]

Thanks Pricklely Peete. I will open up the MK6 and give it a shot. Will post results back soon.

 

[penguindude]

Took apart the amp, re-tightened the transformers, but the hum still exists, at the same level. It might just be my amp or the nature of the transformer.

EDIT: I have tried plugging the amp into a different outlet. Although the hum is still present, the level has definitely reduced! It must be something to do with electricity and such. I will try to figure out what's causing this.