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Old 5th March 2013, 11:20 AM   #1
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Default ef89 ef86

i want to changle the 1st gain of my amp, i put of the 12ax7 circuit and i use ef86.........but i have in my warehouse one ef89....mmm the filaments and the amperes is same between those tubes....but are same????????????????
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Old 5th March 2013, 11:40 AM   #2
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EF86 is a sharp cutoff tube for low frequency use, EF89 is a remote cutoff tube for high frequency use (usually 10.7Mhz IF).
If you need cheap EF86, use the russian equivalent: 6Ж32П
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Old 5th March 2013, 12:41 PM   #3
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oooo thank you....the russian ef86 cost 8 dollars and the british ef86 cost 15 dollars (mullard)...it's the same or better than russian???
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Old 5th March 2013, 08:08 PM   #4
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You can use practically any sharp cutoff pentode instead of EF86.

I have got good results with these:

6J38P 6BH6 EF190 HF Pentode Tube Russian Made Qty 6 | eBay
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Old 6th March 2013, 08:07 AM   #5
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it's not the same.....the 6j32p have 9 pins and the 6j38p have 7 pin......
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Old 6th March 2013, 08:16 AM   #6
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I tried to say that well performing audio amplifier can be built with practically any sharp cutoff pentode. It does not have to be EF86.
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Old 6th March 2013, 10:05 AM   #7
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Quote:
Originally Posted by plig88 View Post
oooo thank you....the russian ef86 cost 8 dollars and the british ef86 cost 15 dollars (mullard)...it's the same or better than russian???
The russian tube is an exact copy of the western EF86. Large stocks are available - that's one issue why it's so cheap compared to the western NOS versions. About the sound ? I don't know...I
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