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Old 23rd March 2006, 12:28 AM   #11
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Exactly Brian.

I usually try to respect individual hearing experiences (my Mother taught me good manners), but some are a bit thick. But I am also perturbed by tests in an article I have just reread (in a reply to another thread re 6L6s), that 6L6s tested for distortion (triode), gave figures from 0,62% to 1,18%. As a pentode the figures ran from 0,95% to 1.25%. These for different makes.

But then the writer also states that 7027s are "quite different" from 6L6GCs and need to be rebiased, etc. Well now..... (for the unintiated, they are exactly the same, except for maximum ratings). I guess back to your point then.

But I am off thread now.
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Old 16th December 2013, 11:28 AM   #12
Scheff is offline Scheff  Germany
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Yes, there atre so many points ov view to know which tube to use. As Iīd like to describe: Things like the choice of a tube or a partner has to be done by everybody him(her)self.

E182CC doesnīt sound exactly like 5687 or 6N6P oe whatever. Replacements are n o t the same.
I have heard the E182CC as an input stage at 86V and 2,4mA or a little less where it sounds great, 3D, air in sound , stage. excellent with a little lack of bass. (you can try other voltages and currents...)
If I ran it at 3,4 mA, the sound went sharp. But in all, itīs one of my favourite input tubes. In datasheet we can see, that itīs a low Z output tube , so it must be good as an output stage, right?
No wrong, the sound at 6mA was too harsh and I didnīt like the punch in bass. Not my favourite output stage at all...Well if you like that sound, itīs unique anyway, take what you like..
So, I stopped reading sounds, but test and l i s t e n to everything I can with any tube I want to know. Thatīs the long way and the only one I know to find a personal truth which is very subjective indeed.
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Old 25th June 2014, 06:45 PM   #13
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If I may resurrect some 8 years after starting:

At present there appears to be a bewildering array of offerings from all over in the marketplace. Prices vary by a factor of up to 20!

From members' experience at this time I would again please like some commentary, particularly on what to avoid regarding poor life and inconsistency of characteristics ( ĩ1/ĩ2 needs to be fairly similar) etc. Are 6N6 and perhaps others possible alternatives from life point-of-view? I read commentary that ECC99s (JJ) were not long-lasting. (Pin connections may differ as this is for a new project; I am using them as plate resistor loaded drivers at 500V plate supply, Va = 230V, Pa = 2,5W per triode, high output amplitude.)

Much obliged!
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Old 26th June 2014, 11:14 PM   #14
rongon is offline rongon  United States
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Quote:
Originally Posted by Johan Potgieter View Post
If I may resurrect some 8 years after starting:

At present there appears to be a bewildering array of offerings from all over in the marketplace. Prices vary by a factor of up to 20!

From members' experience at this time I would again please like some commentary, particularly on what to avoid regarding poor life and inconsistency of characteristics ( ĩ1/ĩ2 needs to be fairly similar) etc. Are 6N6 and perhaps others possible alternatives from life point-of-view? I read commentary that ECC99s (JJ) were not long-lasting. (Pin connections may differ as this is for a new project; I am using them as plate resistor loaded drivers at 500V plate supply, Va = 230V, Pa = 2,5W per triode, high output amplitude.)

Much obliged!
Hi Johan,

I have used USA-made 5687 and 5687WB quite a bit, and have a couple pair of 7119 as well. The USA-made tubes seem to last a really long time, even when run with Ea = 140V and Ia = 18mA. The 5687's last 2 years at minimum, used just about every day.

I have been using 6N6P (1988 production) and Sovtek 6N30P (2002 production) quite a bit lately. Keeping my 5687's on the shelf for later. I've found I need to replace these more often, but they last at least a year in this service. I think they are pretty good, and fresh ones perform very well. No catastrophic failures, nothing dramatic. I just replace them when they begin to look and sound tired (brown tinge to glass, 'sleepy' sound).

I bought maybe 24 of 6N6P and went on a testing binge with a friend's TV-7. I got many tubes with tightly matched sections. Only a very few were very far off. My batch of 5687WB were not quite as consistently matched section-to-section, but I still got many matched pairs of those too.

I hope that helps.

--

Last edited by rongon; 26th June 2014 at 11:17 PM.
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Old 30th June 2014, 02:55 PM   #15
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I have used the 7044, 7119, and 5687 for many years with resistor plate loads as well as CCS. I generally run them about 6mA to 10mA at about 120V to 140V on the plate. My personal preference is the TungSol 5687, but I really think that it depends on the operating conditions as well as the circuit.
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Old 30th June 2014, 08:34 PM   #16
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E182CC @ The National Valve Museum
Could a 12BH7A work ? I found it worked for ECC82 and was obviously better.

Last edited by nigel pearson; 30th June 2014 at 08:37 PM.
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Old 3rd July 2014, 08:13 PM   #17
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Thanks gentlemen,

Much obliged.
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