Mic Kaczmarczik's TubeInformation - The Blue Guitar
Mic Kaczmarczik's TubeInformation - The Blue Guitar
Mic Kaczmarczik's TubeInformation - The Blue Guitar
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From postmaster@triodeel.com Sun Nov 8 11:36:22 CST 1998<br />
Article: 137713 of alt.guitar.amps<br />
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From: postmaster@triodeel.com (Ned Carlson)<br />
Newsgroups: alt.guitar.amps<br />
Subject: Re: Convert from Cathode Bias 6V6 TO EL-84<br />
Date: 8 Nov 1998 04:02:06 -0600<br />
Organization: Triode Electronics<br />
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On Sun, 08 Nov 1998 02:50:29 -0800, Bill Young<br />
wrote:<br />
>Do these require radically different bias resistors on I tried it and<br />
>bias seems low with 6v6 Cathode resistors ..... Thanks Bill<br />
><br />
>Anyone been there done that ?????<br />
Just look at this diagram:<br />
http://www.triodeel.com/dyna6bq5.gif<br />
To switch between 6V6 (or 6AQ5) and 6BQ5, the cathode resistor<br />
is changed from 250 to 130 ohms. This is a rough rule of thumb,<br />
6BQ5's use about half the value of cathode resistor as 6V6 does.<br />
Ned Carlson Triode Electronics "where da tubes are!"<br />
2225 W Roscoe Chicago, IL, 60618 USA<br />
ph 773-871-7459 fax 773-871-7938<br />
12:30 to 8 PM CT, (1830-0200 UTC) 12:30-5 Sat, Closed Wed & Sun<br />
http://www.triodeel.com<br />
Your Start Page for Tube and Tube Amp info on the net...<br />
http://www.triodeel.com/tlinks.htm<br />
From mathe.nospam@kabelfoon.nl Sun Nov 8 11:37:01 CST 1998<br />
Article: 137722 of alt.guitar.amps<br />
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From: "Marc"<br />
Newsgroups: alt.guitar.amps<br />
Subject: Re: Convert from Cathode Bias 6V6 TO EL-84<br />
Date: Sun, 8 Nov 1998 14:43:08 +0100<br />
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Xref: geraldo.cc.utexas.edu alt.guitar.amps:137722<br />
You're correct Ned, but I would like to add a small thing:<br />
To avoid that any unbalance in the duet of tubes might influence the bias<br />
point of each tube, use 2 seperate kathode resistors of 250 Ohms / 3Watt.<br />
Marc<br />
>To switch between 6V6 (or 6AQ5) and 6BQ5, the cathode resistor<br />
>is changed from 250 to 130 ohms. This is a rough rule of thumb,<br />
>6BQ5's use about half the value of cathode resistor as 6V6 does.
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