Hello,
my search for the next amp-projekt ist still not finish. So i have to check the sources for some items. I look for some Eimac 327A Did anybody know a source oder sell some?
Thanks
greedings from Germany
Ps: to sell?...write a PM
my search for the next amp-projekt ist still not finish. So i have to check the sources for some items. I look for some Eimac 327A Did anybody know a source oder sell some?
Thanks
greedings from Germany
Ps: to sell?...write a PM
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Thanks....I will try it....
Wow....375$ for one Tube.....sorry...the price is "from a other star"
Wow....375$ for one Tube.....sorry...the price is "from a other star"
I just did some experiments with a 327A today. See the latest posts in this thread: Corona: An Ultra-Low Distortion A2 DHT SE Amp Prototype
From a famous vacuum tube audio magazine article:
"Good is not cheap, and cheap is not good".
Sometimes that is true, sometimes not.
But what is more often true is:
Obsolete-ium is not cheap.
Un-obtain-ium is not cheap.
The rule of rarity.
The price of Quality . . . Generally, if it says Eimac, it is not cheap.
Pick a tube, pay the price.
"Good is not cheap, and cheap is not good".
Sometimes that is true, sometimes not.
But what is more often true is:
Obsolete-ium is not cheap.
Un-obtain-ium is not cheap.
The rule of rarity.
The price of Quality . . . Generally, if it says Eimac, it is not cheap.
Pick a tube, pay the price.
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At buying Eimac power tubes, I would insist that they should be tested. I have bought 5pcs of 4E27 tubes from two different official sellers in USA, three of them were without vacuum, and two with very different measured plate currents. Of course, I have got some compensation by sending some other small tubes to me. But some money and a lot of efforts have been wasted. In fact, we see almost no designs reported with Eimac power tubes. I saw some posts, saying that the top pin design is a weak point in Eimac power tubes. On the other hand, if one would manage to get a good working pair of Eimac, good sound result is quite probable with them.
Eimac glass power valves, like the 4E27 and their predecessor Heintz and Kaufman "Gammatron" 257-B, do not have continuously operating getters like receiving valves. They're gettered by chemicals on the anode that must be heated (a lot) to work. Normal operation is assumed to be with the anodes glowing (some) red.
If the valves haven't been operated this hot in a while we must expect them to be somewhat gassy, and the valve must be re-gettered by heating the anodes for a while. Several recipes for this process exist on this forum, at least one within the past year or so.
Don't throw away gassy Eimacs without really good cause. A good rule of thumb is to just re-getter all of them before use, including occasional touchups if operation is very conservative (150mA on a type 304TL or similar, for example).
All good fortune,
Chris
If the valves haven't been operated this hot in a while we must expect them to be somewhat gassy, and the valve must be re-gettered by heating the anodes for a while. Several recipes for this process exist on this forum, at least one within the past year or so.
Don't throw away gassy Eimacs without really good cause. A good rule of thumb is to just re-getter all of them before use, including occasional touchups if operation is very conservative (150mA on a type 304TL or similar, for example).
All good fortune,
Chris