Avalon 747 tubes, compressor tubes?

Dirty Halo · 14th March 2006

What kind of tubes are they (I know they are Sotek 6922s), but are they compressor tubes or just tubes put in the path for warmth?

Where in the path are they, pre/post compressor, etc.

Any help would be great. Thanks.

andrews

DIRTY HALO www.dirtyhalo.com

Dirty Halo · 15th March 2006

Did this get moved?

TLH · 15th March 2006

IMHOP, NOS tubes sound better than the soviet or chinese tubes sold today. I understand that the U.S. quit making tubes about 1980, so pre 1980 tubes are what you are looking for if you want US. As far as identification of the tubes, it is what the tube actually is, rather than where it is at in the signal chain. For example, twin diode, triple diode, rectifying ect...

The guy who really know this stuff is Brent Jessee. He is a friendly sort, and will return an email post haste. One other thing to remember when dealing with tubes, unlike some circuits, tube circuits really pack a wallop! Lots of voltage and lots of amps! Also, don't handle the glass. I have heard that handling can damage tubes.

I have replaced the tubes in my Millennia, UA and most of my tube mics with closest Telefunken tube I could get. Also, keep in mind that bias can be an issue as well. Ask Brent Jessee to provide replacements that don't need bias adjustments. Although the Millennia can be bias adjusted, many other amps can't. I don't know if you Avalon can be adjusted or not. One other thing, quality tube replacement can be really expensive. I have some tubes that sell for over $150.00 each.

Hope this helps

uniquelyrx · 8th February 2009

Are the tubes soldered in?

14th March 2006	#1
Dirty Halo Lives for gear Join Date: May 2005 Location: Hollyweird Posts: 7,377 Thread Starter	Avalon 747 tubes, compressor tubes? What kind of tubes are they (I know they are Sotek 6922s), but are they compressor tubes or just tubes put in the path for warmth? Where in the path are they, pre/post compressor, etc. Any help would be great. Thanks. andrews DIRTY HALO www.dirtyhalo.com

15th March 2006	#3
TLH Gear nut Join Date: Aug 2005 Posts: 79	Help with Audio Tubes IMHOP, NOS tubes sound better than the soviet or chinese tubes sold today. I understand that the U.S. quit making tubes about 1980, so pre 1980 tubes are what you are looking for if you want US. As far as identification of the tubes, it is what the tube actually is, rather than where it is at in the signal chain. For example, twin diode, triple diode, rectifying ect... The guy who really know this stuff is Brent Jessee. He is a friendly sort, and will return an email post haste. One other thing to remember when dealing with tubes, unlike some circuits, tube circuits really pack a wallop! Lots of voltage and lots of amps! Also, don't handle the glass. I have heard that handling can damage tubes. I have replaced the tubes in my Millennia, UA and most of my tube mics with closest Telefunken tube I could get. Also, keep in mind that bias can be an issue as well. Ask Brent Jessee to provide replacements that don't need bias adjustments. Although the Millennia can be bias adjusted, many other amps can't. I don't know if you Avalon can be adjusted or not. One other thing, quality tube replacement can be really expensive. I have some tubes that sell for over $150.00 each. Hope this helps

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