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Old 27th October 2003, 11:31 AM   #1
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Default #27 tube for line amp?

In my quest for yet another line amp project I have uncovered possibly another jewel. I found a set of #27 tubes and not being an expert like some here, the curves look very close to those of the 26. It has its pros and cons.. 1.75 amp at 2.5 volt heater for one. It should make for something interesting.

Any comments here would be appreciated.


Joe
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Old 27th October 2003, 02:57 PM   #2
45guy is offline 45guy  United States
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Default yes, yes, the 27!

I think it's a great sounding tube, especially the mesh plate versions. Unfortunately, most of the meshies that I have are microphonic. I picked up quite a few a couple of months ago and still don't have a great matched pair. Oh well, the solid plate varieties are pretty darn good too. I threw together something very quickly and ran them at pretty much book value. A little noisey but it was built out of scraps from previous projects and clip leads hung out the bottom. It was enough for me to know that I will be spending some time with this tube.

Have you seen this one- http://www.suertenich.com/html/schematic.gif

Cheers,
Tom
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Old 27th October 2003, 03:24 PM   #3
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Hi,

The 27 is close to the 26 but is a DHT and requires a 5 pin socket.

No idea what it sound like...

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Old 27th October 2003, 11:31 PM   #4
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Tom

Thank you very much for the link. It has a nice schematic that will be a very good place to start. I'm not getting the fancy mesh plate tubes because all my projects aren't very fancy. The tube kind of interested me so I figured what the heck. It sounds like my hopes for the 27 will be met since you like yours. The 26, what I have together of it at least sounds very good but is somewhat ill manored. The 27 sounds like it will be really close to the 26 without needing to run the heater off batterys.

Frank

I will keep you posted with the outcome of the 27 project after I finish the 26 ordeal.


Joe
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Old 28th October 2003, 04:30 AM   #5
45guy is offline 45guy  United States
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Hi Joe,

This thread got me in the mood to take a crack at it again and see if I can get things quieted down some. Well, it's fairly quiet now with a low uf CLCLCLC supply. I think I have determined that anywhere you run this tube, it just sounds good. My op points were not even close while I was messing with the supply and it still sounded good at 80+ volts drawing less than 1ma. I find it interesting that the tube data says to reference the heater supply midpoint to the the cathode. I'm running them floating off a big DC supply right now but I'll try AC with the CT to the cathodes in the morning.

Good luck on the 26 project.

Tom
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Old 28th October 2003, 10:24 AM   #6
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Tom

I'm glad I got you interested in the 27 again. Maybe I can talk you into posting your final schematic on the board. It will be interesting to see what it takes to make this tube behave.


Joe
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Old 21st December 2003, 12:06 AM   #7
Ryssen is offline Ryssen  Sweden
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Any one have the schema for 27,as the link is not working.
quetion 2:The tube 27and 76, anybody have compared these 2
tubes in sound quality?
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Old 21st December 2003, 12:10 AM   #8
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Hi,

Quote:
Any one have the schema for 27,as the link is not working.
The Suertenich link you mean?

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Old 21st December 2003, 12:27 AM   #9
Ryssen is offline Ryssen  Sweden
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Yes. Or have any other?
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Old 21st December 2003, 12:31 AM   #10
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Hi,

Quote:
Yes. Or have any other?
Search locally on a preamp using the #26 by Burnedfingers, you should find some links in there.

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