[Judge Buff]

Quote:

Originally Posted by igotyofire /img/forum/go_quote.gif will i be able to notice this difference if the difference to me between amped & unamped are subtle...granted i can hear the difference, but mostly between base with the stock tube... if i upgrade the tube will i get a noticeable difference in sound i guess is what im asking

I did with several tubes. The Phillips JAN 6922 mentioned is my 3rd best sounding tube, so far. The best by far is a Siemens E88CC/6922 branded as an RCA. I had to tweak the pots to get it right, but it is unbelievably spacious with deep bass and precise mids and crystal highs. I have others on the way, but I doubt any of them will beat the awesome RCA.

If you get a good replacement tube (6922, E88CC by Telefunken, Siemens, Philips, Mullard, et.al.) and you can't tell a difference from the stock tube, I wouldn't buy any more expensive audio gear, as you might never be able to discern the differences in great sounding music. My wife can't tell any difference between the TV and my surround sound system or a car radio and my SRH440s.

 

[igotyofire]

Quote:

Originally Posted by Judge Buff /img/forum/go_quote.gif I did with several tubes. The Phillips JAN 6922 mentioned is my 3rd best sounding tube, so far. The best by far is a Siemens E88CC/6922 branded as an RCA. I had to tweak the pots to get it right, but it is unbelievably spacious with deep bass and precise mids and crystal highs. I have others on the way, but I doubt any of them will beat the awesome RCA. If you get a good replacement tube (6922, E88CC by Telefunken, Siemens, Philips, Mullard, et.al.) and you can't tell a difference from the stock tube, I wouldn't buy any more expensive audio gear, as you might never be able to discern the differences in great sounding music. My wife can't tell any difference between the TV and my surround sound system or a car radio and my SRH440s.

thanks for the quick response, im not sure what pots are tho. Are those the legs that plug into the socket?...i want some relatively plug in play, i dont want to break anything if its an obvious adjustment of those legs and they bend easy then i wouldn't mind trying it. hopefully others will chime in on the fav tube so far

 

[johnnyb3]

Quote:

Originally Posted by wallace /img/forum/go_quote.gif Maxed out the yellow pots,no diff,walkman still sounds better with out it. I guess it's back to having the coolest paper weight on the block.

Mine shipped in late October, and when it showed up it didn't work properly -- in fact I got no sound besides a buzzy whine. I let the seller know, and they got back to me right away that there was a known issue with some of the power supplies they were shipping. They sent me a new power supply right away ('course, it took two weeks to show up). Now it works great, and I'm quite pleased all around.

 

[fenixdown110]

It will change the tube sound but won't magnify it.

 

[lecky]

The pots mentioned are the two little yellow things between the volume pot and the tube. I haven't got around to tweeking them yet.

 

[Mannevond]

What do the yellow pots adjust? Gain? If so, would lowering the gain too much cause oscillation like it will in opamp based amps like the CMoy (given that one uses an opamp which is prone to oscillation)?

 

[brendon]

Damm you head-fi ! I just bid and won one of the amps for $37 + shipping and I really did not need this.

Also bought a once tested Sylvania 6DJ8 tube to try out. - 6DJ8 X1 JAN SYLVANIA TUBE AMP APLIFIER TESTED - eBay (item 380167228242 end time Nov-25-09 03:36:22 PST)

Hopefully I will enjoy these with the HD650.

I always wanted a tube amp for the HD650 but could not because of the high prices of tube amps & the fact that my dad makes home amps and I thought it would be rude to use something other than his amps. But this one is too cheap to pass the chance not to use it.

 

[fenixdown110]

I'm really having a debacle. It's either get this amp for under 50 bucks or save up and get a LDMKII or DarkVoice 336i/SE.

 

[brendon]

I say get this amp for cheap and then have some fun rolling the tubes. Find out which tubes sound best and then get a much better tube amp than the LDMKII next year.

 

[igotyofire]

Quote:

Originally Posted by Mannevond /img/forum/go_quote.gif What do the yellow pots adjust? Gain? If so, would lowering the gain too much cause oscillation like it will in opamp based amps like the CMoy (given that one uses an opamp which is prone to oscillation)?

is that what he means by tweeking? looks like a philips screw driver fits in the yellow tops, just turn them to adjust...what is the left and right one for when facing the front of the device?

 

[Sebhelyesfarku]

Quote:

Originally Posted by brendon /img/forum/go_quote.gif I always wanted a tube amp for the HD650 but could not because of the high prices of tube amps & the fact that my dad makes home amps and I thought it would be rude to use something other than his amps. But this one is too cheap to pass the chance not to use it.

So now you use not just other amp than his, but a cheap one! Even more rude!

 

[Judge Buff]

Quote:

Originally Posted by igotyofire /img/forum/go_quote.gif is that what he means by tweeking? looks like a philips screw driver fits in the yellow tops, just turn them to adjust...what is the left and right one for when facing the front of the device?

"Tweaking" is making small adjustments. I only had to turn each pot ~10 degrees. I think the right pot is the heater current and the left is overall gain. Only adjust one at a time and know where the original position was for each.

When I turned the right pot about 10 degrees counter clockwise, my right channel got louder and smoothed out. The left pot made the music louder when I turned it about 10 degrees clockwise. I didn't use a screwdriver. I used a decent pair of needle nose pliers while I was listening to the amp. I was very, very careful not to touch anything but the wheels when I was tweaking the pots.

 

[weibby]

It's crazy how these babies are flying off the shelves.
So far 6 listing snipes have failed.

 

[igotyofire]

Quote:

Originally Posted by weibby /img/forum/go_quote.gif It's crazy how these babies are flying off the shelves. So far 6 listing snipes have failed.

supply & demand........bid higher

 

[jageur272]

There shouldn't be an overall gain pot (if it is, it's just volume, not true gain as tubes have set gain). Most likely, it's a bias trimpot.