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Little Dot I+ Tube Rolling - Page 151

post #2251 of 2260
Quote:
Originally Posted by beachpea View Post

I have a tube compatibility question for use with my LD1+.

I have a pair of NOS Russian 6J3P-E tubes I'm afraid I've mistakenly purchased for this amp. From research I've done, these tubes appear to belong to the EF96 family, not EF91, EF92, or EF95, as prescribed for the LD1+. Can anyone tell me if these are compatible or incompatible tubes? If compatible, which internal jumper settings do they require?

Many thanks!

 

The 6J3P (EF96 / 6AG5) has the same pinout as the EF95, so it is compatible. Long ago, I tried a pair of Sylvania 6AG5WA and they were not good. lol :)


Edited by gibosi - 4/6/15 at 7:13pm
post #2252 of 2260

Thanks for the reply and information about the 6J3P-E tubes. I tried them in my LD1+ and they immediately started humming quietly but perceptibly. The hum remained the same at all volumes, so I cleaned the tube pins which resulted in slightly less hum. Perhaps with time they'll quiet down, but their sound is only okay, not great. Perhaps that will improve, too. The good news, I guess, is that they weren't expensive....

 

Are there other factors besides a tube's pinout that affect tube compatibility?

 

Thanks again!

post #2253 of 2260

For a visual, these are the 6J3P-E tubes in question.

post #2254 of 2260
Quote:
Originally Posted by beachpea View Post
 

Thanks for the reply and information about the 6J3P-E tubes. I tried them in my LD1+ and they immediately started humming quietly but perceptibly. The hum remained the same at all volumes, so I cleaned the tube pins which resulted in slightly less hum. Perhaps with time they'll quiet down, but their sound is only okay, not great. Perhaps that will improve, too. The good news, I guess, is that they weren't expensive....

 

Are there other factors besides a tube's pinout that affect tube compatibility?

 

New tubes are often a bit noisy, with a bit of hum, but typically, they will quiet down after 20 hours, or so.

 

When considering which tubes to try as drivers, two factors are most important. One is pin-out. But sometimes with a little creativity, we can compensate for that. For example, 6AU6 and 6AV6. And the second is heater current. The LD is limited to tubes that draw about 0.45 Amps.

 

A lot of this work has already been done and summarized in the main little dot tube rolling thread, page 77:

 

http://www.head-fi.org/t/563884/little-dot-tube-amps-vacuum-tube-rolling-guide/1140#post_9392055

post #2255 of 2260

just ordered the voskhods, hopefully will have in two weeks! found a matched pair for 12 bucks from 1973

post #2256 of 2260

I listened to the '73 for about a week before I swapped them for '87 (both Voskhod pairs).  I can't tell the difference.  :o 

post #2257 of 2260

Hi all,

excuse me if I go a little off-topic but I have a question:

i am looking for a new entry-level tube amplifier for my earphones (beyerdynamic dt880 250ohm) and I am undecided between this Little Dot I+ and the Little Dot MKII.

Can someone tell me pro and cons of the two?

Thank you and apologies,

post #2258 of 2260
Quote:
Originally Posted by XipeTotec View Post

 

excuse me if I go a little off-topic but I have a question:

i am looking for a new entry-level tube amplifier for my earphones (beyerdynamic dt880 250ohm) and I am undecided between this Little Dot I+ and the Little Dot MKII.

Can someone tell me pro and cons of the two?

 

 

Generally speaking, the LD 1+, with an op-amp output stage, would be better for low-Z headphones. And the LD MKII, with a vacuum tube output stage, would be better for high-Z headphones.

post #2259 of 2260

Can someone suggest a good op-amp and tube combo to pair with Philips Fidelio X1s? I just got the headphones and they sound very bassy (and somewhat muddy) when driven through my Yulong D100 built-amp headphone amp, while my little dot tames the bass somewhat (just a bit). I want to love my new X1s but I am just not digging their sonic signature compared to my other headphones. Thanks!

post #2260 of 2260

I have never heard the Philips X1....  Anyway, I seem to remember that you have the OPA2107AP and Mullard EF92? And I assume you want less bass? If so, the MUSES01 may be a good choice. And again, the tall-bottle 6HM5 are cheap and well worth a try.

 

In the end, everyone has different ears and different gear. No one can tell you the best combination for your ears and gear. We can offer a few suggestions, but that is all we can do. The best way is for you take the time to roll through a number of op-amps and tubes to discover which combinations hit the sweet spot for you.

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