A pal of mine clued me in to a cool way to install with a fuse holder to use with these same type of fuses.
When they blow, ya just replace the fuse / tube. Perhaps diagnose your problem.
The fuse holder is this little guy:
Tube Fuse Holder
Basically, they are a small 3 pin break away pin socket with the middle pin removed.
I was thinking, heck... I could have made that!
40 PIN Machined Break Away Female Header Connector
My pal suggested these fuses:
315 mA fuses for a KT88 tube:
315mA KT88 Fuses
These fit right in without trimming the leads. Use these or the fuses Roy sent along, just give them a little trim. I think my pal is being more conservative, Roy’s mA rating being less will blow faster, perhaps safer.
Soldering instructions for me, the hobbyist, not a vendor
If you twist the lugs on the octal socket ever so slightly you can get them in. Put a pliers under them to hold them up at an angle. Tack one pin with solder. Then make sure the other is lined up and solder it. Then put more solder on the first pin. Do not overheat. Solder quickly. Buy a couple of spares in case you screw up the first one. Once installed just plug the fuse in and you are done.
If a tube blows it will just blow the fuse. You can tell by simply measuring the resistance between the pin 1 and 8 socket holes from above with the amp off and tube removed. It will read 1 to 1.3 ohms when fuse is fine. Infinite of course if you blew the fuse. Then simply pull the bottom of the amp, plug in new fuse, install new KT88 and the auto bias will take care of it…
Hope this helps, makes swapping fuses a bit easier.
Last edited by aguaazul on Tue May 22, 2018 11:05 pm; edited 1 time in total (Reason for editing : Loss of 1/2 of the data)