Golden Tube

service_guy · 19th February 2010, 02:47 AM

Hi All.
I have a GTA SE-85 that is a real piece of work.

I was still working at a dealer when I purchased it for personal use some 11 yrs ago, and if anyone knows about these (they don't work........period

) i have listened to it maybe 10 hrs in 10 years.
The problem is, according to a tube amp guy I have looking at it, that the screen's are at 700 volts and EL-034's should be at a max of 425 volts.
If anyone has had any luck with finding a way to correct these to work properly I would love to know.

It is like this.
AudiogoN ForSale: Golden Tube SE-85

Dave.

planet10 · 19th February 2010, 03:04 AM

Dave,

Do you have a schematic?

My 1st thot would be to regulate the screen supply (for pentode) or put a level shifter on the screens (psudeo triode)

dave

Eli Duttman · 19th February 2010, 03:07 AM

Do you have the schematic? We're flying blind without it.

planet10 · 19th February 2010, 03:22 AM

Sounds like we have an echo in here

service_guy · 19th February 2010, 04:17 AM

Hi guys.
The gentleman who is looking at it for has it. I will get a copy tomorrow if he can fax it to me.
Dave.
PS. Thanks for the fast response.

service_guy · 20th February 2010, 12:31 AM

Hi guys.
Here are the schematic's of the SE-85.
Let me know what you think.
Dave.

Eli Duttman · 20th February 2010, 12:36 AM

Quote:

Originally Posted by service_guy

Hi guys.
Here are the schematic's of the SE-85.
Let me know what you think.
Dave.

Can you convert those files to gif or jpg? No MS Word here and Word Pad can't handle the imbeded graphics.

Ty_Bower · 20th February 2010, 12:49 AM

Quote:

Originally Posted by Eli Duttman

Can you convert those files to gif or jpg?

As you wish.

http://i69.photobucket.com/albums/i4...ube/schem1.gif
http://i69.photobucket.com/albums/i4...ube/schem2.gif
http://i69.photobucket.com/albums/i4...ube/schem3.gif

service_guy · 01:06 AM

Hi.
Sure can.
Quaility may suffer.
I can email them to you if you wish.
PM me with your email.
Dave.

Eli Duttman · 20th February 2010, 01:16 AM

Thanks to Ty. I got a look. The resistor in series with the EL34 screen grid limits current. Still, I think Planet10 gave good advice. Have the tech install a Maida style regulator in each channel. Not only is the g2 voltage held within published limits, regulating g2 B+ is a proven method for improving the linearity of full pentode mode O/P tubes. Full pentode mode is what I see in the drawings.

19th February 2010, 02:47 AM	#1
service_guy diyAudio Member Join Date: Jan 2010 Location: Ottawa	Golden Tube Hi All. I have a GTA SE-85 that is a real piece of work. I was still working at a dealer when I purchased it for personal use some 11 yrs ago, and if anyone knows about these (they don't work........period) i have listened to it maybe 10 hrs in 10 years. The problem is, according to a tube amp guy I have looking at it, that the screen's are at 700 volts and EL-034's should be at a max of 425 volts. If anyone has had any luck with finding a way to correct these to work properly I would love to know. It is like this. AudiogoN ForSale: Golden Tube SE-85 Dave.

19th February 2010, 03:04 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Dave, Do you have a schematic? My 1st thot would be to regulate the screen supply (for pentode) or put a level shifter on the screens (psudeo triode) dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

19th February 2010, 03:07 AM	#3
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Do you have the schematic? We're flying blind without it. __________________ Eli D.

20th February 2010, 01:16 AM	#10
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Thanks to Ty. I got a look. The resistor in series with the EL34 screen grid limits current. Still, I think Planet10 gave good advice. Have the tech install a Maida style regulator in each channel. Not only is the g2 voltage held within published limits, regulating g2 B+ is a proven method for improving the linearity of full pentode mode O/P tubes. Full pentode mode is what I see in the drawings. __________________ Eli D.

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19th February 2010, 03:22 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Sounds like we have an echo in here

19th February 2010, 04:17 AM	#5
service_guy diyAudio Member Join Date: Jan 2010 Location: Ottawa	Hi guys. The gentleman who is looking at it for has it. I will get a copy tomorrow if he can fax it to me. Dave. PS. Thanks for the fast response.

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