Comments on: Mods to the working GA-5 http://www.paleoelectronics.com/blog/2008/01/mods-to-the-working-ga-5/ Clueless Idiots and High Voltage Vacuum Tubes Really Do Mix! Sun, 05 Sep 2010 17:52:02 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Dilapidus http://www.paleoelectronics.com/blog/2008/01/mods-to-the-working-ga-5/comment-page-1/#comment-56 Dilapidus Tue, 10 Jun 2008 01:59:58 +0000 http://www.paleoelectronics.com/blog/?p=35#comment-56 Hi, Sorry I didn't get back to you sooner, but yes, she's cathode biased. The key here is that the voltage across the first stage is 1.5 v. Few if any guitars can produce that right off the pickups, but if you have active pickups, you'd better figure out how much you are pumping. Probably need a scope to do that. VMMs aren't very useful there. Hi,

Sorry I didn’t get back to you sooner, but yes, she’s cathode biased. The key here is that the voltage across the first stage is 1.5 v. Few if any guitars can produce that right off the pickups, but if you have active pickups, you’d better figure out how much you are pumping. Probably need a scope to do that. VMMs aren’t very useful there.

]]> By: Ignacio Langarica http://www.paleoelectronics.com/blog/2008/01/mods-to-the-working-ga-5/comment-page-1/#comment-55 Ignacio Langarica Tue, 10 Jun 2008 00:43:46 +0000 http://www.paleoelectronics.com/blog/?p=35#comment-55 Hello again! Definitely the Skylark Crestline is a cathode biased amp. I think this means it is a Class A amplifier. Anyway, being cathode biased, bias adjustment is less than an issue. Hence, it´s easier to experiment with different brands of 6AQ5s !!! Saludos !, Ignacio Hello again!

Definitely the Skylark Crestline is a cathode biased amp. I think this means it is a Class A amplifier.

Anyway, being cathode biased, bias adjustment is less than an issue. Hence, it´s easier to experiment with different brands of 6AQ5s !!!

Saludos !,

Ignacio

]]> By: Ignacio Langarica http://www.paleoelectronics.com/blog/2008/01/mods-to-the-working-ga-5/comment-page-1/#comment-54 Ignacio Langarica Mon, 09 Jun 2008 13:08:55 +0000 http://www.paleoelectronics.com/blog/?p=35#comment-54 Hello from Madrid! I own 2 Gibson GA-5 Skylark Crestlines (no tremolo, 2 6AQ5 p/p config), and I´m learning how to maintain and improve it. Thanks to your website I already fix a couple of things, but now I need to know about the bias configuration. I don´t know if the amp is cathode biased (self biasing then), or I need to change some resistor every time I change the 6AQ5s. I know the amp is not "single ended", because the push pull configuration, but , is it Class A?, or Class AB? Thanks a lot for your help !!! Your website is a great help and a big fun to read! Best regards, Ignacio Hello from Madrid!

I own 2 Gibson GA-5 Skylark Crestlines (no tremolo, 2 6AQ5 p/p config), and I´m learning how to maintain and improve it. Thanks to your website I already fix a couple of things, but now I need to know about the bias configuration.

I don´t know if the amp is cathode biased (self biasing then), or I need to change some resistor every time I change the 6AQ5s.

I know the amp is not “single ended”, because the push pull configuration, but , is it Class A?, or Class AB?

Thanks a lot for your help !!! Your website is a great help and a big fun to read!

Best regards,

Ignacio

]]> By: test equipment repair http://www.paleoelectronics.com/blog/2008/01/mods-to-the-working-ga-5/comment-page-1/#comment-53 test equipment repair Fri, 15 Feb 2008 19:43:08 +0000 http://www.paleoelectronics.com/blog/?p=35#comment-53 Thanks for a fine read! Thanks for a fine read!

]]> By: Vanessa http://www.paleoelectronics.com/blog/2008/01/mods-to-the-working-ga-5/comment-page-1/#comment-52 Vanessa Mon, 11 Feb 2008 14:19:08 +0000 http://www.paleoelectronics.com/blog/?p=35#comment-52 Very Nice Site! Thanks! Very Nice Site! Thanks!

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