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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Quicksilver GE8417 power rating posted by razzwill@gmail.com on January 16, 2007 at 19:22:51:
The step-down transformer needs to be rated for the maximum load expected. Since you do not know load your amplifier places on the power line you need to calculate it. The rating of your step-down transformer is in watts, as you have said. Since the amp manufacture does not provide the necessary information we need to calculate the wattage requirement. This is done using the formula Watts = Volts x Amps.The amplifier requires 120 volts. The fuse rating is 2 amps. This is then 120 volts x 2 amps = 240 watts.
Have you checked to see if your amplifier has the necessary power transformer windings to work at 220 volts directly? This is not uncommon.
I do not know the exact current draw your amplifier places on the line, but is is probably a little less than 2 amps when at full power. If you use a 200 watt step-down transformer you should use one for each amplifier. If you use a 2000 watt transformer you could use one for both amplifiers.
As for changing to EL34, 6CA7, KT77, KT88 or most other commonly used output tubes; The 8417 is a higher transconductance tube than the others which means it has a lower bias voltage and lower drive requirements. Rob has already said this but it is important. Your amplifiers might not be easily converted to a different tube due to the availability of bias voltage and drive capability from the previous stage. If you consider changing output tubes keep this in mind. Also, the other tubes do not sound the same. If you really like the sound you currently have you might be disappointed with the sound of the other tubes.
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Follow Ups
- Re: Quicksilver GE8417 power rating - beermanpete@socal.rr.com 22:45:49 01/17/07 (0)
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