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Elrog 300B vs Takatsuki 300B tubes

Has anyone heard the Elrog 300B tubes ? I read an article which mentioned that the Elrog 300B delivers 15% less power than a traditional 300B tubes. Can anyone confirm that it is audible ?

I am choosing between Elrog and Takatsuki 300B tubes. I would prefer the Elrog because it is cheaper and supposedly wonderful but if it really sounds less powerful then I have to rethink.
pani
charles1dad's avatar
charles1dad
10,250 posts
 
Hi Al,
In your opinion given the values that George measured, do you feel these represent a high stress level on the 300b tube or more of a moderate level? The heat dissipation levels measured by George are higher than the 26 watts that Israel cited for the amplifier. Although 31 W seems well off the maximum of 39 or 40 W dissipation for the 300b. Is the plate voltage similar to your VAC Renaisance?
Thanks,
Charles,
snopro
397 posts
 
Charles, George said I should have no problem using the tubes in my amps. Yours are older then mine, make sure the cathode resistors are the same and the rest of the values didn't change.

Best,
Joe
almarg's avatar
almarg
9,670 posts
 
Hi Charles,

My only knowledge of the 300B operating parameters in my VAC Renaissance 70/70MkIII consists of the values Raquel provided in the thread I quoted from earlier. In which he said that the plate-to-cathode voltage is approximately 430 volts (compared with 484-79 = 405 for the Elrog in this case), with an idle current of approximately 85 to 90 ma (compared with 77 ma for the Elrog in this case). Also, based on those numbers for my amp, 90 ma x 430 volts = 38.7 watts plate dissipation.

The numbers George measured for the Elrog seem to me to be moderate.

Best regards,
-- Al
charles1dad's avatar
charles1dad
10,250 posts
 
Al and Joe,
Thanks much! These measurement findings do suggest that the Elrog tube should be fine in the Frankenstein amplifier. Al your selected 300b tubes must be vefy rugged to tolerate the parameters in your amplifier and provide the durability and longevity they do I need to measure my wall outlet AC voltage to be sure that it is not excessive.
Charles,
brownsfan
1,508 posts
 
All, my AC measures 122.1 V. I got the same number last week as I did last November, so I am a little concerned regarding tube longevity in my Frankensteins. I did check to verify I have no red dots on the cathodes. My power company will not address the issue unless the voltage is outside of 120 V plus or minus 5%.

I guess there is a silver lining to not having much listening time for the last couple months. Until if figure something out, I can reinsert my Psvane T's so that the Elrogs aren't compromised.

I have followed the thread since its inception, and am most grateful to all those doing the heavy lifting on sorting through this. However, I am uncomfortable allowing the 122. 1 V situation to stand "unrectified." Were I to utilize a variac, I would probably require two due to my AC wiring configuration. Any recommendations on a relatively inexpensive variac? How about using one of the PS audio power plants with the Franks, which would require some limited room rewiring?
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