An illustrated guide to building an F5
- Thread starter 6L6
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+1 to both...
Measuring accurately to the 10th of an ohm between the two may not be the easiest. Try a few turns and see what it does for your own knowledge. If you find that too many turns has too little a change, and you're still worried, count turns from click to click and center.
Also adding to the previous... if you can't get to the bottom of the board, or just don't want to since they're mounted already, measuring across R3 and R4 is an option.
Measuring accurately to the 10th of an ohm between the two may not be the easiest. Try a few turns and see what it does for your own knowledge. If you find that too many turns has too little a change, and you're still worried, count turns from click to click and center.
Also adding to the previous... if you can't get to the bottom of the board, or just don't want to since they're mounted already, measuring across R3 and R4 is an option.
Anybody know a source for IRFP240s and '9240s?
I fried R13 on the left channel. I got a little hasty and careless while doing the biasing back-and-forth, and watched in horror as my meter showed 1V, rapidly climbing. Then smoke, so I shut it down. Fuse didn't blow. Right channel plays fine, so I'm anxious to hear the stereo version.
I've had the F4, F6 (stock, not DIY) and Aleph J, so I'm kind of working backwards vis-à-vis other folks' order of selection. So far, the F4 is king, but it's also a PITA if you don't give it enough voltage swing.
Edit: forgot my ACA, which I'm thinking of upgrading with some IRFP150s. Big assumption there, "upgrading".
I fried R13 on the left channel. I got a little hasty and careless while doing the biasing back-and-forth, and watched in horror as my meter showed 1V, rapidly climbing. Then smoke, so I shut it down. Fuse didn't blow. Right channel plays fine, so I'm anxious to hear the stereo version.
I've had the F4, F6 (stock, not DIY) and Aleph J, so I'm kind of working backwards vis-à-vis other folks' order of selection. So far, the F4 is king, but it's also a PITA if you don't give it enough voltage swing.
Edit: forgot my ACA, which I'm thinking of upgrading with some IRFP150s. Big assumption there, "upgrading".
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Depending on how many you want... whether you want them matched... enough to match... etc...
The store here.
Swap meet here.
One of your other amps
Octopart.com is a great resource if your normal places are out of one or the other and/or if you're looking for a manufacturer other than Vishay.
Mouser (but with a short wait)
The store here.
Swap meet here.
One of your other amps
Octopart.com is a great resource if your normal places are out of one or the other and/or if you're looking for a manufacturer other than Vishay.
Mouser (but with a short wait)
