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In Reply to: RE: 7189 recommendation for Sherwood S-5000 posted by airtime on March 11, 2014 at 06:24:50
There is a Russian tube called the 6π14π that is exactly equivalent to a ruggedized EL84, that is, a 7189. "Rugged" means a higher plate dissipation rating, 14W versus 12W for a standard EL84. McShane and others have this tube. This will be your best bet.
I believe the Sovtek EL84M and maybe the Electroharmonix EL84 are this same 14W tube. The other New Sensor EL84 equivalents (e.g. the Gold Lion) are only rated 12W, I believe.
Follow Ups:
Pardon my butting in here but...the 7189 equivalents are the 6π14π-EV/EB (5K hr) or the -ER/ED (10k hr). The EL84M is at least the EV version and maybe the ER depending on vintage. The non-suffixed 6π14π are decent but not as rugged as the suffixed versions.
…but it appears the difference is mainly in mechanical durability, at least according to http://www.tubes.ru/techinfo/HiFiAudio/6p14pev.html. This source lists the plain, -V and -EV versions all as 14W plate dissipation, but the suffixed tubes can tolerate higher acceleration, vibration etc. However, another source seems to list the plain 6p14p as a 12W tube.
Certainly the -EV or -ER versions will be a safer bet in the Sherwood. On the other hand, sources list the maximum plate dissipation for the 7189 as either 12W or 13.2W, so I really don't know what the minimum requirement would be.
The single biggest difference is the 7189's ability to handle higher anode voltage ~400V vs ~300 for EL84. Not good at Cyrillic but the datasheet that comes with the ER seems to indicate 450 or 500V on the anode and 14W. Regardless, I've used ERs in apps that beat the crap out of 6BQ5s and they aren't phased.
Steve
What about the 6p14p-ER and EV series? Would those be 7189s? The 6p15p I know are EL84s but I haven't got any.
Honest amplification is better than excessive 2nd order distortion anytime.
As JJ states, to best of my knowledge and experience the 6p14p-ER and EV are essentially 7189s, maybe even a bit more rugged in the long run. Note that 6p14p is the pretty much the arabic form of cyrillic 6π14π. This Russian designation and transliteration stuff gets so confusing....
It doesn't have the internal connection of the suppressor grid (g3) to the cathode so this has to be applied inside the amp, and there are some differences in the parameters. Decware uses the 6p15p-EV version in some of their smaller amps, and I use them (in PP) in one of mine. The 6p14p with various suffixes is a true member of the EL84 family, and based on what Steve writes and the data sheets, the -EV and -ER are at least pretty comparable to a 7189.
I have been using the 6P14P-EV and ER series as 7189s but I wanted to double check to be sure and you guys confirmed it.I don't pay any attention to the Russian military specs on the tubes because they are application rated and not actual rated.We know this from the 6P3Se saying those tubes have 350v max plate rating which we know is not right because I run them in Mac Mc240s all day long and in VTA ST70s.
Honest amplification is better than excessive 2nd order distortion anytime.
Edits: 03/12/14
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