EL84 Unused pins safe to connect?

rotaspec · 15th January 2010, 09:27 PM

Some of the pins of the EL84 are shown as IC (Internal connection I suppose).
Is it safe to use these as tie points?
Here's an example: The Hazen mod uses the separated suppressor connection on pins 1 and 6 of the SV83/6P15 but these are "IC" on the EL84 datasheet. If I build an amp with the Hazen-enabled 6P15 and then want to use an EL84 (I know the Hazen won't work with EL84) in the same circuit, do I have to unsolder the connections to pin 1 or 6?
Don't want to damage my precious NOS Philips EL84s

Gary

SY · 15th January 2010, 09:32 PM

Quote:

Is it safe to use these as tie points?

Generally not. If a pin is safe to use, it will have an NC as a code.

rojoknox · 15th January 2010, 09:37 PM

Greetings from FixitLand!

Caveat on using 6BQ5's in modern EL84 amps!

I would leave pins 1, 6 and 8 open. In fact, I *did,* in my "AMP II." That way, I can use a 6BQ5/EL84, 7189 or 7189A interchangeably.

Take care,
--
J. E. Knox 'The Victor Freak'

rotaspec · 15th January 2010, 09:42 PM

Thanks, Sy. I'll have to try and remember to unsolder them when I finally knock the 6P15 Hazen version up. I currently have the EL84s in stereo SE driven by a 6N3P-EV and it sounds very nice, and wanted to try 6P15-EV with Hazen mod for comparison.

Gary

rotaspec · 15th January 2010, 09:49 PM

Thanks rojoknox. Interesting post that, especially cutting the pins off the tube. Yikes!!

15th January 2010, 09:27 PM	#1
rotaspec diyAudio Member Join Date: Nov 2007	EL84 Unused pins safe to connect? Some of the pins of the EL84 are shown as IC (Internal connection I suppose). Is it safe to use these as tie points? Here's an example: The Hazen mod uses the separated suppressor connection on pins 1 and 6 of the SV83/6P15 but these are "IC" on the EL84 datasheet. If I build an amp with the Hazen-enabled 6P15 and then want to use an EL84 (I know the Hazen won't work with EL84) in the same circuit, do I have to unsolder the connections to pin 1 or 6? Don't want to damage my precious NOS Philips EL84s Gary

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15th January 2010, 09:37 PM	#3
rojoknox diyAudio Member Join Date: May 2007	Greetings from FixitLand! Caveat on using 6BQ5's in modern EL84 amps! I would leave pins 1, 6 and 8 open. In fact, I did, in my "AMP II." That way, I can use a 6BQ5/EL84, 7189 or 7189A interchangeably. Take care, -- J. E. Knox 'The Victor Freak'

15th January 2010, 09:42 PM	#4
rotaspec diyAudio Member Join Date: Nov 2007	Thanks, Sy. I'll have to try and remember to unsolder them when I finally knock the 6P15 Hazen version up. I currently have the EL84s in stereo SE driven by a 6N3P-EV and it sounds very nice, and wanted to try 6P15-EV with Hazen mod for comparison. Gary

15th January 2010, 09:49 PM	#5
rotaspec diyAudio Member Join Date: Nov 2007	Thanks rojoknox. Interesting post that, especially cutting the pins off the tube. Yikes!!

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