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Old 10th August 2011, 07:27 AM   #1
Dagwood is offline Dagwood  New Zealand
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Default E180F V EF184

Hi

I have a little headphone amp running Mullard EF80's or EF184 (much quieter).
Last night I found a nice pair of E180F tubes in my stock, would these be a straight swap seems the only pin out difference is that the screen is connected to Grid 3, all other specs seem close.

Any thoughts would be great, as I would like to build another as a preamp and have heard the E180F is a good choice

Cheers
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Old 10th August 2011, 06:01 PM   #2
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Great choice! E180F-Phillips-gold pins - is my favorite pretube for my SE-s 2A3 and 300B! /it sister is amazing E186F/.

Last edited by azazello; 10th August 2011 at 06:05 PM.
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Old 10th August 2011, 07:14 PM   #3
Dagwood is offline Dagwood  New Zealand
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Thanks azazello

Do you think the screen connection to G3 will be an issue?
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Old 10th August 2011, 08:28 PM   #4
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http://frank.pocnet.net/sheets/009/e/E180F.pdf
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Old 11th August 2011, 02:39 AM   #5
Dagwood is offline Dagwood  New Zealand
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Thanks for the link

Sorry, I must have not been clear?

I have had a look at the datasheet and noticed that the screen on the E180F is connected to Grid 3 ( pin 8 ) and wondered if it will work instead of a EF184? the EF184 has the screen on pin 6. Can these be swapped over???

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Old 11th August 2011, 03:47 AM   #6
alexg is offline alexg  Philippines
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Quote:
Originally Posted by azazello View Post
Great choice! E180F-Phillips-gold pins - is my favorite pretube for my SE-s 2A3 and 300B! /it sister is amazing E186F/.
Can you share your schematic of the E180F and 2a3? I have a pair of Philips 6688 with gold pins.
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Old 11th August 2011, 07:20 AM   #7
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You can't directly replace EF184 with E180F, whithout rewiring the screen connection. -pin 9 from EF184 to pin 8 from E180F -pin 8 from EF184 to pin 9 from E180F -Cut wire from pin 6 (EF184) to ground, and leave te connection free. By the way, the Russian equivalent to E180F is 6J9P (6ж9п). These are very unexpensive and very good tubes. It's worth a trial.
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Last edited by Blaireau; 11th August 2011 at 07:23 AM.
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Old 11th August 2011, 08:48 AM   #8
Dagwood is offline Dagwood  New Zealand
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Hi Blaireau

Thanks for that, It might pay for me to just use these on the preamp rather than trying to mod the headphone amp.

I guess my question was also aimed at the compatibility and people thoughts of the E180F?

I just had a look on Ebay for the 6J9P, your right at only $1.50 USD a piece!! Might try a few.

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Old 11th August 2011, 04:45 PM   #9
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Quote:
Originally Posted by Blaireau View Post
You can't directly replace EF184 with E180F, whithout rewiring the screen connection. -pin 9 from EF184 to pin 8 from E180F -pin 8 from EF184 to pin 9 from E180F -Cut wire from pin 6 (EF184) to ground, and leave te connection free. By the way, the Russian equivalent to E180F is 6J9P (6ж9п). These are very unexpensive and very good tubes. It's worth a trial.
They are the same....., but sounding is some different, I have and I don't like 6J9P /close is 6J11P/.
Alexg, This is my SE 2A3-RCA. Plate resistor E180F now is 13 kohm /not 33 kohm/ and upper
resistor 12 kohm now is 3 kohm/:
https://picasaweb.google.com/1095707...13827582447474

Last edited by azazello; 11th August 2011 at 05:03 PM.
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Old 11th August 2011, 05:28 PM   #10
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6j9p are excellent when triode wired in an SRPP stage. To be true, I don't use "normal" stages in amplifiers anymore. SRPP is really the best architecture among all.
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