[AlexRoma]

 

[TMRaven]

What kind of power tubes would you suspect to pump more bass into a signature?  I already got the CV4010s for my MK2, and they havn't fully burned in yet, but I suspect I'll still want some extra presence out of the really low frequencies (20-40hz)

 

[Impulsive]

Tung-Sol 6AK5 / 6AK5-W are known for their punchy bassy sound.
I did not tried them yet but they are on my list.

 

[TMRaven]

Are those power tubes?

 

[mordy]

The power tubes for the MkIII are all Russian to the best of my knowledge. (Those are the big ones in the back.)
I am not aware of any US or British power tubes for the MkIII. There seems to be a consensus that the type 6H30Pi - DR tubes are the best. These are Russian military tubes made for demanding applications that require very strict quality control and very small tolerances. These tubes should be good for 10,000 hours.
There is a rumor that the Russians came to the conclusion that in the event of a nuclear war tubes would fare better than transistors; thus the research and development of "super tubes." (Don't know if this is true - maybe somebody can verify or debunk this?)

 

[Dept_of_Alchemy]

A quality alternative to the 6H30Pi -DR (which are incredibly expensive IMO) is the Electro Harmonix 6H30Pi Gold Pin. I've used them in my MkIII with good results, certainly much better sounding than the stock 6H6P.
 
- DoA

 

[PanamaRed]

The seller calls these 6N30P-DR / 6H30 Pi. Is this what I keep on reading about as being the best power tube for this amp?

http://cgi.ebay.com/MATCHED-PAIR-6N30P-DR-6H30-Pi-SUPER-TUBES-UNUSED-TESTED-/160611767300?pt=Vintage_Electronics_R2&hash=item2565351404
Quote:

A quality alternative to the 6H30Pi -DR (which are incredibly expensive IMO) is the Electro Harmonix 6H30Pi Gold Pin. I've used them in my MkIII with good results, certainly much better sounding than the stock 6H6P.
 
- DoA

 

 

[Impulsive]

Quote:

Are those power tubes?

no i am talking about driver tubes, as 85% of the sound produced belongs to driver, and about 15% to the power tubes.
Easy and simple, power tubes just transparently amplify, what driver tubes give them.

 

[KMASCII]

Quote:

thanks.
First time i was unsuccessful, but now equiped with flashlight i was successful.
But sad news, it's rev. 1.0
so i am kinda ..scr.....ed.
I do not feel like doing that resistor mod, i am not that skilled.

Sorry to hear you've got the v1.0 board. Just FYI then here is a photo of Russian 6H6n and the 6H30Pi-EH.
 

 
The 6H30Pi looks to have a triple mica construction and the 6H6n just double.

 

[Impulsive]

thanks for that photo comparison.
I really wondered what's the dimensions of EH 6H30Pi and see visual comparison.

 

[AlexRoma]

This is the general MKIII power tube ranking :
 
6N6Pi -> 6N6P ->> 6N30P [Sovtek] -> 6N30Pi [Electro-Harmonix ] -> 6N30P-EV [Sovtek] ->> 6N30P-DR [Reflektor] 
 
Letters at the end means:
 
i - impulse circuit

E - long life
V - high reliability

D - extra long life
R - extra high reliability
 
Ru / En
 H   =  N
П,n  = P
 
Buy the way... Are there better midrange-oriented, lush sounding tubes then Mullard M8100 (CV4010) ?
In no way brighter on highs, same extended and undistorted but sweeter, lusher, warmer ...  (for my DT880's) 

 

[Impulsive]

nice explanation. but what means impulse circuit?
And you ranked it as worse as standard one.

 

[AlexRoma]

Lets just stay simple... HiFi Audio in most case use linear, constant current circuits..  Other hardware may be constructed on Impulse current circuit base, not HiFi at least.   
Most HiFi constructors (like Lampizator for instance), recommend us classical, 6N6P tubes, instead of 6N6Pi .
But 6N30Pi from Electro-Harmonix are another story.. These one have golden pins and premium hifi oriented build.. 
 
By the way, guys interested in Power Tubes upgrade, check this one while you still can...
As for me, I think I'll get these one 6N30Pi-EV [Electro-Harmonix], if only they ship to East Europe . 

 

[Impulsive]

thanks for explanation.
price on that russian DR tubes is great.
I just installed new Mullards EF 91 / CV5377  nad currently listening to them.
Lets see if i am deaf because i do not hear difference between stock GE5654 yet.

 

[Frank I]

IMO the Sovtexk 6H30 works best in little dot amps. I would buy them from a reputable dealer also