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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 227

post #3391 of 10501

What is the setting for double triodes EF-92 or EF95  .Thanks.

post #3392 of 10501
Quote:
Originally Posted by MIKELAP View Post

Ya i know did not find 30 gauge wire settled for 22 gauge .What i tried instead of screwing around taking the adaptor apart i soldered wires on the exterior of the socket in the holes on top where the numbers are not pretty but alot alot less problematic now having a bit of a problem making solder stick to the metal what can be done for that. thanks.
The metal on the screw sections is old has has probably quite a bit of corrosion on it. Take the emery cloth to it and you should bring out the brass underneath. Then since it is fairly thick it will require a good deal of heat. Heat up the cleaned metal till the solder will melt by touching it to the metal and not the iron. Always have the metal hot enough to melt the solder.

I'll drop some 30AWG wirewrap wire in an envelope for you tomorrow. It needs to look good so you can do up the inside of the socket.
beerchug.gif
post #3393 of 10501
Quote:
Originally Posted by TrollDragon View Post


The metal on the screw sections is old has has probably quite a bit of corrosion on it. Take the emery cloth to it and you should bring out the brass underneath. Then since it is fairly thick it will require a good deal of heat. Heat up the cleaned metal till the solder will melt by touching it to the metal and not the iron. Always have the metal hot enough to melt the solder.

I'll drop some 30AWG wirewrap wire in an envelope for you tomorrow. It needs to look good so you can do up the inside of the socket.
beerchug.gif

OK thanks for the tip .Dont bother i did them outside as long as they work ill try them like that .Thanks anyways should get my tubes tomorrow or the day after got that panavise vise today what a nice vise so versatile i love it.

post #3394 of 10501

I just received the tubes that i ordered JAN GE 5654W,BRIMAR EF92,INTERNATIONAL/SYLVANIA 6AK5,MINIWATT/PHILIPS EF91 are this brand any good?

post #3395 of 10501
Quote:
Originally Posted by MIKELAP View Post
 

What is the setting for double triodes EF-92 or EF95  .Thanks.

 

EF95. :)

post #3396 of 10501

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This interest me since i run a pioneer sx750 interesting!  his comments are regarding the mk4SE        

 

Re: Little Dot Mk 9

Postby DavidZheZhe » Sep 25th, '13, 06:35

 
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Re: Little Dot Mk 9

New postby DavidZheZhe » Sep 24th, '13, 17:35

Robbie California wrote:How would this compare with the LD MKIV SE version in terms of a headphone amp and would it be an improvement over the LD MKIVSE as a stereo preamp? Is there much in the way of upgraded parts compared to the IV SE or are they similar in that regard?


For headphone usage sound is a littler purer due to no output capacitor in the signal path. For pre-amp usage, there's also protection from DC offset so that you can use it with any power amp (dc coupled as well)

Edited by MIKELAP - 10/9/13 at 5:14pm
post #3397 of 10501
MK9 tubes seem to be between $20 - $50 for some NOS, lots of used cheaper.

Finally some protection on the preamp outs.

But for $530 your starting to creep into the "better" amp class, for the same price you can get a WooAudio WA3 which uses the 6080 & 2 6DJ8's stock.

Something to think about.
biggrin.gif
post #3398 of 10501
Quote:
Originally Posted by Artsi View Post

Another thing i have to say is that 7-1 strap does not seem to work right with MK II. It adds hum and buzz. And it comes stereo, so i don't think i have made anything wrong with switch-mod.

Rollers here strap 1-7 with a socket wire on the MK II without noise, possibly try setting your switches to EF-95 & NS and then put a strap wire in 1-7 with the tubes to see if the hum returns.

Also a 1-7 strap while in EF-92 mode might cause you some serious hum as well.

 

I'd double check your wiring with a meter.

:beerchug:

 

 

post #3399 of 10501

Well got my 6BQ7A tubes this morning took a picture and pointed out what needs to get bent or cut is it the right pinsThanks.

 

post #3400 of 10501
Quote:
Originally Posted by MIKELAP View Post
 

Well got my 6BQ7A tubes this morning took a picture and pointed out what needs to get bent or cut is it the right pinsThanks.

 

 

The mirror image...... You have marked pins 1, 7, 8 and 9. But you want to cut or bend pins 9, 1, 2 and 3. 

 

So in your picture, the top three pins from the left: 1, 2 and 3. And on the bottom, from the left, the first pin: 9.

post #3401 of 10501
Quote:
Originally Posted by gibosi View Post
 

 

The mirror image...... You have marked pins 1, 7, 8 and 9. But you want to cut or bend pins 9, 1, 2 and 3. 

 

So in your picture, the top three pins from the left: 1, 2 and 3. And on the bottom, from the left, the first pin: 9.

 

 

 

post #3402 of 10501
Quote:
Originally Posted by gibosi View Post
 

 

The mirror image...... You have marked pins 1, 7, 8 and 9. But you want to cut or bend pins 9, 1, 2 and 3. 

 

So in your picture, the top three pins from the left: 1, 2 and 3. And on the bottom, from the left, the first pin: 9.

That would be right.OK just saw your picture thanks.

post #3403 of 10501

Well my first try doesnt work im getting big hum.with pins 6and 7 cut does the socket still go in the same pin hole on the littledot?

post #3404 of 10501
Quote:
Originally Posted by MIKELAP View Post
 

Well my first try doesnt work im getting big hum.with pins 6and 7 cut does the socket still go in the same pin hole on the littledot?

 

Yes, you insert the adapter into the socket the same as always.

 

I suspect it is your solder joints. You need to have a very solid and tight mechanical connection before you solder. Again, I encourage you to get some 30 gauge wrapping wire so you can tightly wrap it around the adapter pins 2 or 3 times. Good luck! :)

post #3405 of 10501
Quote:
Originally Posted by gibosi View Post
 

 

Yes, you insert the adapter into the socket the same as always.

 

I suspect it is your solder joints. You need to have a very solid and tight mechanical connection before you solder. Again, I encourage you to get some 30 gauge wrapping wire so you can tightly wrap it around the adapter pins 2 or 3 times. Good luck! :)

You were right gibosi about solder had a loose connection  sounds good now . Thanks .

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