1. On the Fender AB763 Schem from the TAB, the schem says all resistors 1/2 watt unless other wise marked. Does this apply to pots?
2. What does RA mean on a pot? A is audio and L is linear, correct?
3. Some pots have more values than just type and resistance, like 50k - RA - 2 - 35 for the intensity pot. What do the 2 and 35 represent? I'm guessing watts and something else?
4. Any recommendations for the recto diodes? I don't even know where to begin there in terms of necessary voltage/current rating. Obviously I need diodes that can take at least 340v (PT secondary voltage) but how much margin do I need, and are there current or power ratings involved?
Twin Build Questions
Moderators: pompeiisneaks, Colossal
Re: Twin Build Questions
Check the Schem and Layout for Weber's 6A20..... might have more information.
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- Darkbluemurder
- Posts: 585
- Joined: Tue Jan 03, 2006 7:28 pm
Re: Twin Build Questions
1. Not sure but in good designs (such as the Twin Reverb) there is no significant DC going through the pots.benoit wrote:1. On the Fender AB763 Schem from the TAB, the schem says all resistors 1/2 watt unless other wise marked. Does this apply to pots?
2. What does RA mean on a pot? A is audio and L is linear, correct?
3. Some pots have more values than just type and resistance, like 50k - RA - 2 - 35 for the intensity pot. What do the 2 and 35 represent? I'm guessing watts and something else?
4. Any recommendations for the recto diodes? I don't even know where to begin there in terms of necessary voltage/current rating. Obviously I need diodes that can take at least 340v (PT secondary voltage) but how much margin do I need, and are there current or power ratings involved?
2. RA = Reverse audio
3. no idea
4. A typical arrangement would be 3 IN4007 diodes in a row. Wiring diodes in series increases the PIV (peak inverse voltage). There are diodes with higher PIV rating than IN4007. 1kV should be good.
BTW I always wondered why tube rectifiers should be more prone to failure than solid state rectifiers. Since I started working on amps (only since December 2001) I have blown 2 solid state rectifiers but never a tube rectifier.