Search found 872 matches

by Old BF Shred
Thu Jun 16, 2016 10:20 am
Forum: Express Series
Topic: 1960 A 4 ohm cab
Replies: 5
Views: 1582

Re: 1960 A 4 ohm cab

Yes, assuming the speaker in the 5:50 is 8 ohms and it likely is, unless it was changed out. And yes you would be using the 4 ohm jacks.
The 4 ohm cab should only be used by itself. :)
by Old BF Shred
Mon May 09, 2016 10:52 am
Forum: Rectifier Series
Topic: Amp not working
Replies: 4
Views: 1013

Re: Amp not working

Look carefully at tube V1, usually closest to input. Is the filament lit up? If not and assuming it's not a bad tube, you have lost the low voltage power supply section, or some part of it. This will require a tech to look at it.
Good luck! :)
by Old BF Shred
Wed Nov 11, 2015 12:45 pm
Forum: Mark V
Topic: Mark V Combo blowing fuses on power up - high voltage
Replies: 13
Views: 942

Re: Mark V Combo blowing fuses on power up - high voltage

I agree that, if it is still under warranty, you should take it to a Mesa authorized tech and let them worry about it. Also be sure you have Mesa output (and perhaps even rectifier) tubes in it (in case you had ordered another brand) when you do, as they may tell you that using non Mesa output tubes...
by Old BF Shred
Tue Aug 18, 2015 8:42 pm
Forum: Mark V
Topic: Mark V issues : Crackle popping ; changed V1 V7 but no luck
Replies: 8
Views: 793

Re: Mark V issues : Crackle popping ; changed V1 V7 but no l

Small toggle switch on back panel next to FX loop jacks. See page 40 of owners manual. Also plugging a cable in from send to return jacks essentially accomplishes the same thing for this procedure. :wink: Hard bypass completely eliminates the FX Loop circuit, including two triodes (V4A & V6B). Usin...
by Old BF Shred
Mon Aug 10, 2015 11:52 pm
Forum: Mark V
Topic: Mark V issues : Crackle popping ; changed V1 V7 but no luck
Replies: 8
Views: 793

Re: Mark V issues : Crackle popping ; changed V1 V7 but no l

Small toggle switch on back panel next to FX loop jacks.
See page 40 of owners manual.
Also plugging a cable in from send to return jacks essentially accomplishes the same thing for this procedure. :wink:
by Old BF Shred
Sun Aug 09, 2015 2:58 pm
Forum: Mark V
Topic: Mark V issues : Crackle popping ; changed V1 V7 but no luck
Replies: 8
Views: 793

Re: Mark V issues : Crackle popping ; changed V1 V7 but no l

Monstercastle wrote:I'd lean more towards power tubes, since the problem is with all channels.
+1
Output tubes can definitely cause this problem.

One other thing (though, I admit, a 15 min warm up should not affect this)...have you tried bypassing the FX loop? The switching jacks used on these can cause noise as well.
by Old BF Shred
Tue Jun 09, 2015 12:28 am
Forum: Modern Era Amps (1991-Present)
Topic: Where to buy a relay?
Replies: 15
Views: 4304

Re: Where to buy a relay?

Are you certain the relay is bad? A poor solder joint could also cause these symptoms. Try gently rocking the relay back and forth as opposed to tapping it. If it acts up, try touching up the solder on the pins and look for cracks in PCB/solder joints in the vicinity. Even if this makes no differenc...
by Old BF Shred
Sun May 17, 2015 12:47 pm
Forum: Mark V
Topic: Something Blew Up
Replies: 8
Views: 1073

Re: Something Blew Up

Sometimes a tube will go into "thermal runaway". Basically if the tube gets too hot, the control grid stops working as it should and the tube will draw excessive current and can "red plate". Often just going back to standby, until the tubes cool, will correct the problem. If caught in time, usually ...
by Old BF Shred
Sun May 10, 2015 10:25 pm
Forum: Vintage Amps (Before 1991)
Topic: 6L6 diode across pin-3 to pin-8, why?
Replies: 2
Views: 995

Re: 6L6 diode across pin-3 to pin-8, why?

Yes. It is called ringing and I have seen other amps with diodes off of the primary to dampen it. Music Man comes to mind.....
They also offer some level of protection if the amp is accidentally operated without a speaker load. :)
by Old BF Shred
Wed Apr 29, 2015 3:42 pm
Forum: Rectifier Series
Topic: Single Rectifier Severe Humming
Replies: 4
Views: 936

Re: Single Rectifier Severe Humming

By all means, swap out the tubes. Even 2 month old tube can go bad. Are you sure you're buying tubes that are rated for Mesa's bias range? (most vendors will know what you need). Under-biased output tubes will often hum just before failure. As screamingdaisy says, look for tube plates glowing red......
by Old BF Shred
Wed Apr 22, 2015 10:51 pm
Forum: Mark V
Topic: Something Blew Up
Replies: 8
Views: 1073

Re: Something Blew Up

It is likely only 1 tube went...2 failing in the same amp at the same time is pretty unlikely. You could just replace the one if your replacement matches the other three. Screen resistors are not usually difficult or expensive to replace, but still should be left to a technician. You probably alread...
by Old BF Shred
Tue Apr 21, 2015 11:08 pm
Forum: Mark V
Topic: Something Blew Up
Replies: 8
Views: 1073

Re: Something Blew Up

Sounds like a tube went. Not uncommon even when fairly new... May have shorted internally and fried a screen resistor which is likely what you smell. Usually this will cause the fuse to blow, but not always. (Do make sure you have the properly rated fuse in there.) There are some other things that c...
by Old BF Shred
Mon Apr 20, 2015 10:21 pm
Forum: Classifieds
Topic: FS: Carvin DC600 Purple Burl (Option 50)
Replies: 7
Views: 2132

Re: FS: Carvin DC600 Purple Burl (Option 50)

Actually, if I was in the market and had the funds to spend on gear, I would consider it!
I know how good those guitars are! :wink: :)
by Old BF Shred
Sun Apr 19, 2015 12:27 pm
Forum: Classifieds
Topic: FS: Carvin DC600 Purple Burl (Option 50)
Replies: 7
Views: 2132

Re: FS: Carvin DC600 Purple Burl (Option 50)

Had to take a moment to say...that is one striking guitar! I will vouch for Carvin. I absolutely love my ST300; it has become my main gigging guitar. Carvin has top notch craftsmanship overall, awesome playability and great finishes. The most pleasant surprise was how smooth the optional stainless f...
by Old BF Shred
Sat Apr 18, 2015 3:21 pm
Forum: Lonestar Series
Topic: Reverb not working on Lonestar Special
Replies: 1
Views: 1184

Re: Reverb not working on Lonestar Special

2 things to check right off: Cables to and from spring tank. Try re-seating them to ensure they have a good connection. Cables can and do go bad; try a spare(s) if you have one. Try a different tube in reverb driver position (refer to manual as to which one this is). These are quick and easy checks ...