Little Dot MKIII Tube Rolling
Apr 12, 2019 at 4:49 PM Post #3,331 of 3,397
I've been using a pair of 6HM5's from the link mordy posted above for several months, I don't think a year yet. Anyhow I started getting a hum out of the right channel so I sprayed the sockets with Deoxit and also I cleaned the pins on the tubes and still had a hum. I switched to the Voshkod tubes and all is well. Anyhow my question is how common is this with tubes? Is this unusual or an ordinary occurence?

Thanks
 
Apr 13, 2019 at 5:15 PM Post #3,332 of 3,397
Little Dot MK III with NOS Tung Sol 6SN7 Power Tubes and C3G Driver Tubes 2 .jpg

I sold my MK III, but here was my best combo.
 
Apr 23, 2019 at 11:00 PM Post #3,334 of 3,397
Thanks. I got the silvertones. I really like the sound on those with my dark voice. Figured they could be backup for it as well. Thank you for your help. I appreciate it. I will let you know how I like the sound when I get it set up in a few weeks ( shipping from China takes a little bit ).


Hi , I just got the adapters from China and used the 6sn7's in the little dot. It sounds worse than the stock tubes!!! Am I doing something wrong ? Is there a setting that I need to change in the amp ? I tried with matching silvertones as well as a GE and Tung Sol that I had handy. It sounds so much better with the stock tubes. I am really confused here. Would really appreciate any help. Thank you much. Gopal
 
Apr 24, 2019 at 6:31 AM Post #3,335 of 3,397
In what way does it sound worse?

Are you sure you have the correct adapters (6SN7 to 6H6)? Some noval tubes (e.g. 5687) have a different pinout.
 
Apr 24, 2019 at 1:09 PM Post #3,336 of 3,397
20190424_095018_HDR.jpg
In what way does it sound worse?

Are you sure you have the correct adapters (6SN7 to 6H6)? Some noval tubes (e.g. 5687) have a different pinout.


Are these the right ones? I mean that the sound is thin , soundstage is reduced, the gain is low and if i crank the volume up, the music distorts. It's pretty bad actually.

Thank you for your response.
 

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Apr 24, 2019 at 2:53 PM Post #3,337 of 3,397
Apr 24, 2019 at 10:26 PM Post #3,338 of 3,397


Thank you so much for your response. Please indulge me as I am new to this tube world. I confirmed before buying this from ebay

https://www.ebay.com/itm/1pc-6SN7-T...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

and

https://www.ebay.com/itm/2PCS-9-PIN...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

The 6sn7 tube fits in the adapter that I got, but the adapter does not fit snugly into the socket saver . Could that be a reason for the bad sound ? I am guessing/hoping that the socket savers are alright. Am I correct there ?

Please let me know if the ones you ordered work fine. I appreciate the help.

Thanks
Gopal
 
Apr 25, 2019 at 1:33 PM Post #3,339 of 3,397
These are considered among the best drivers for the LD MKIII:
https://www.ebay.com/itm/EI-6HM5-EC...m5d4fdb1092:g:prcAAOSwDk5UEhHk&frcectupt=true
You can start with these - not expensive. Then for power tubes buy a pair of inexpensive 6SN7 tubes and a pair of adapters for the LD MKIII and you are set.
Good luck!

Hi mordy, i did as you suggested and got the adapters for the 6sn7 tubes from ebay and the 6hm5 tubes. The 6sn7 sounds worse than stock to my ears. It breaks up a high volumes and the sound is just not crisp / clear. Do you have any suggestions ? Do you think that I got the right adapters or maybe the problem is something else ?

Please indulge my questions as i am really new to this tube world. Any advice appreciated.

This is what I got ..


https://www.ebay.com/itm/1pc-6SN7-T...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

and

https://www.ebay.com/itm/2PCS-9-PIN...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649


Should I have got this instead ??

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.de/ulk/itm/201079159018

thank you much
 
Apr 25, 2019 at 1:40 PM Post #3,340 of 3,397
I am really at a loss why you have a problem because I used the 6SN7 tubes extensively without any ill effects. Do they sound bad with any driver tubes? Are your jumpers set to EF95 tubes?
 
Apr 25, 2019 at 1:43 PM Post #3,341 of 3,397
I am really at a loss why you have a problem because I used the 6SN7 tubes extensively without any ill effects. Do they sound bad with any driver tubes? Are your jumpers set to EF95 tubes?

Did I have to change my jumper settings before using the 6sn7 tubes ? Maybe that is the problem. Can you please let me know. Thank you for your reply
 
Apr 25, 2019 at 2:04 PM Post #3,342 of 3,397
I am really at a loss why you have a problem because I used the 6SN7 tubes extensively without any ill effects. Do they sound bad with any driver tubes? Are your jumpers set to EF95 tubes?
I think that I found your problem - the second adapter has the wrong pinout. The second alternative you listed seems to be the correct one. However, the first adapter you got should be fine by itself - just try that one alone.
Here is a download of a tube pin compatibility utility:
https://en.freedownloadmanager.org/Windows-PC/TDSL-Personal-Edition-FREE.html
 

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