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Post by prsnstrat on Nov 8, 2006 1:37:13 GMT -7
Hi all, I hope someone can shed some light. I just received a mint condition used z-28 off the Gear Page. Put the tubes in, plugged the power cable in and there is nothing. No light, no tube glow, no juice, no sound. I know it is a vague description of the problem but has anyone else run into this at all? Could it be a fuse? How would I tell? Thanks, and sorry i can't provide any more information to help troubleshoot.
Sincerely, Brandon
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redgl
Junior Member
Posts: 62
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Post by redgl on Nov 8, 2006 8:02:55 GMT -7
I'd certainly try replacing the fuse first.
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Post by prsnstrat on Nov 8, 2006 8:20:24 GMT -7
OK i'll do that first. Thanks!
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Post by Bill on Nov 8, 2006 9:08:02 GMT -7
Yes, pull the fuse and check to make sure it's not blown. It probably is, and if so prepare to put in a new rectifier tube, which most likely will solve the blowing fuse issue. Good luck!
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Post by prsnstrat on Nov 8, 2006 9:12:59 GMT -7
Dumb question...but how can I tell, just by looking at the fuse? Honestly, I've never blown a fuse in 15 years of playing tube amps! Strange huh?
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redgl
Junior Member
Posts: 62
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Post by redgl on Nov 8, 2006 9:25:39 GMT -7
The little wire inside the glass will be broken. You may even see a tiny burn mark on the glass itself.
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Post by prsnstrat on Nov 8, 2006 11:03:13 GMT -7
Hmm...it doesn't look like that. *worried*
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redgl
Junior Member
Posts: 62
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Post by redgl on Nov 8, 2006 14:36:38 GMT -7
You really should change that fuse. I'm not saying I know for sure that's the problem but the symptoms seem to indicate it is, if it's not you've eliminated that and you have some extra fuses in your bag just in case.
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Post by Curt on Nov 8, 2006 15:17:53 GMT -7
Make sure the EF86 is in the correct spot as well, probably should pull and reinsert each tube and check the fuse (s) with an ohm meter to be certain as sometimes there will be no visible evidence it is blown.
If you get nowhere drop a PM to Doc.
Best of luck, Curt
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Post by texasjim on Nov 8, 2006 16:37:54 GMT -7
Like tele62 said, the two small 9-pin tubes, the EF-86(V1) and 5751(PI) have to be in the right places. Furthest from the capacitor can, next to the cab wall, is the spot for the EF-86, then the next tube socket is for the 5751(or maybe a 12AX7). The next two 8-pin(octal) sockets are for the 6V6 power tubes. On the other side of the capacitor can is the octal socket for the 5AR4/GZ34 rectifier. Make sure the tubes are in those locations.
Hope this helps. I really love my new(used) Z-28! May I suggest buying Dave Hunter's "The Guitar Amp Handbook"? I just read it and I know so much more about tube amps than I did! I bought my first tube amp in 1960, and just now learned the first thing about 'em. One of the amps Dave features in a Z-28 2-10, with photos of the circuit board and components!
If the fuse is good, and the tubes don't light up, E-mail Doc Z!
Good Luck! Texas Jim
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Post by prsnstrat on Nov 9, 2006 9:11:18 GMT -7
Thanks for sharing your knowledge guys! Well, I think that it is ok now, I took your advice and changed the fuse, and replaced the Rectifier tube. Sure enough it lit up. Sounds great. However, I still can't figure out why the pilot light burned out!?? Does anyone have an idea of what size bulb it takes, and a trick to getting that lil sucker outta there?!? lol. Thanks again guys, this board is such a blessing for novices such as myself.
Peace, Brandon
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Post by Bill on Nov 9, 2006 9:19:12 GMT -7
May I suggest buying Dave Hunter's "The Guitar Amp Handbook"? I just read it and I know so much more about tube amps than I did! I bought my first tube amp in 1960, and just now learned the first thing about 'em. One of the amps Dave features in a Z-28 2-10, with photos of the circuit board and components! Thanks for that, Jim! Just ordered the book, looks like a good read. Prs, glad you amp is up and running.
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Post by Curt on Nov 9, 2006 9:25:24 GMT -7
Thanks for sharing your knowledge guys! Well, I think that it is ok now, I took your advice and changed the fuse, and replaced the Rectifier tube. Sure enough it lit up. Sounds great. However, I still can't figure out why the pilot light burned out!?? Does anyone have an idea of what size bulb it takes, and a trick to getting that lil sucker outta there?!? lol. Thanks again guys, this board is such a blessing for novices such as myself. Peace, Brandon The lamp is a 43 (or is it 47?) any amp parts place will have them, I'd try; secure.tubesandmore.com/As for a trick to get 'em out, fold up or wad up a lil piece of electrical tape Glad she's up and runnin' !
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Post by prsnstrat on Nov 9, 2006 9:53:25 GMT -7
Good karma sent to you all. Thanks again. I am a much happier man today. Bdog
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Post by myles on Nov 14, 2006 12:28:51 GMT -7
The little wire inside the glass will be broken. You may even see a tiny burn mark on the glass itself. If the wire in the fuse is blown at the end cap the fuse will look fine. The only way to tell is to meter the fuse.
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Post by myles on Nov 14, 2006 12:29:54 GMT -7
Like tele62 said, the two small 9-pin tubes, the EF-86(V1) and 5751(PI) have to be in the right places. Furthest from the capacitor can, next to the cab wall, is the spot for the EF-86, then the next tube socket is for the 5751(or maybe a 12AX7). The next two 8-pin(octal) sockets are for the 6V6 power tubes. On the other side of the capacitor can is the octal socket for the 5AR4/GZ34 rectifier. Make sure the tubes are in those locations. Hope this helps. I really love my new(used) Z-28! May I suggest buying Dave Hunter's "The Guitar Amp Handbook"? I just read it and I know so much more about tube amps than I did! I bought my first tube amp in 1960, and just now learned the first thing about 'em. One of the amps Dave features in a Z-28 2-10, with photos of the circuit board and components! If the fuse is good, and the tubes don't light up, E-mail Doc Z! Good Luck! Texas Jim Dave Hunter's book is one of the very very very best books I have ever seen on amps.
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