Search found 71 matches

by ricardo loma vista
Sat Feb 09, 2019 2:46 pm
Forum: Express Series
Topic: Mesa Express 5:25 footswitch issue
Replies: 7
Views: 3740

Re: Mesa Express 5:25 footswitch issue

i had a similar issue in that the drive channel led and reverb led stopped working. i took the footswitch apart and everything looked normal (no visibly cracked solder joints, etc.) but noticed that i could make the LEDs flicker on and off by plugging the DIN cable in or wiggling it, both of whch ca...
by ricardo loma vista
Fri Dec 01, 2017 8:29 pm
Forum: Lonestar Series
Topic: Lonestar 2x12 Chan 1 died during show
Replies: 3
Views: 2224

Re: Lonestar 2x12 Chan 1 died during show

I experienced a similar problem with my Lonestar Special during a gig. I set up the amp using channel 1 for cleans (30 watts, 4 tubes, silicon diode rectifier) and channel 2 for overdrive (15 watts, 2 tubes, tube rectifier). I set the volumes so that Ch 2 was boosted relative to Ch 1. About 5 songs ...
by ricardo loma vista
Sat Nov 11, 2017 1:44 pm
Forum: Express Series
Topic: Anyone Replace C90 In 5.50 Express+ With A Neo Speaker?
Replies: 16
Views: 7524

Re: Anyone Replace C90 In 5.50 Express+ With A Neo Speaker?

I haven't done it in my 5:25 express which is much lighter, but I did replace the black shadow in my lonestar special with a celestion g12 vintage neo to reduce the weight. The vintage neo is not identical to the black shadow, but with EQ adjustment, I can get a similar tone which works for me, and ...
by ricardo loma vista
Tue Oct 11, 2016 6:08 pm
Forum: Modern Era Amps (1991-Present)
Topic: Lonestar Special output impedance question
Replies: 32
Views: 11239

Re: Lonestar Special output impedance question

Yes. The ones marked main outs are the ones that you plug into. I can't find a schematic for this amp, but it appears that when four tubes are engaged in 30 watt mode, the optional Jack is from the 8 ohm tap on the transformer and the mains are from the four ohm tap. When you use the combo speaker p...
by ricardo loma vista
Tue Oct 11, 2016 12:34 am
Forum: Modern Era Amps (1991-Present)
Topic: Lonestar Special output impedance question
Replies: 32
Views: 11239

Re: Lonestar Special output impedance question

Plug each 8 ohm speaker into the two Jack's marked 4 ohm. This will put the two 8 ohm speakers in parallel for a speaker impedence of four ohms.
by ricardo loma vista
Wed Apr 20, 2016 9:18 pm
Forum: Lonestar Series
Topic: Seeking info on the Black Shadow standard in the LSS
Replies: 6
Views: 2654

Re: Seeking info on the Black Shadow standard in the LSS

this a a late reply to an old post, but I did this mod about three months ago. Back problems made me look for ways to reduce the weight of the LSS and one of the things I did was to replace my Black Shadow with a Celestion Century Vintage 12. It does cut about 7 pounds off the weight. Removing the c...
by ricardo loma vista
Sun Mar 17, 2013 11:04 am
Forum: Lonestar Series
Topic: Possible Tube Problem?
Replies: 5
Views: 746

Re: Possible Tube Problem?

Sorry, I don't have a schematic or an LSC to help you out.
by ricardo loma vista
Sat Mar 16, 2013 1:54 pm
Forum: Lonestar Series
Topic: Possible Tube Problem?
Replies: 5
Views: 746

Re: Possible Tube Problem?

If the resistor is completely out, you'll know- smell, maybe a little smoke, red plating of the tube, bad tone.... However, the resistor could partially burn, and still function with a changed resistance. There's no way to tell for sure without inspecting and measuring the ohms of the resistor, but ...
by ricardo loma vista
Sat Mar 16, 2013 12:14 pm
Forum: Lonestar Series
Topic: Possible Tube Problem?
Replies: 5
Views: 746

Re: Possible Tube Problem?

From what you've written, I'd say that you have a bad power tube. I've seen them fail intermittently as you described. But, since it blew the fuse once, total failure is not far away. The bad part about power tubes going out is they sometimes fry the grid resistors. If there's a burnt smell at all, ...
by ricardo loma vista
Fri Nov 09, 2012 7:46 pm
Forum: Lonestar Series
Topic: Rectifier Tube : Do I Need This Thing?
Replies: 1
Views: 1056

Re: Rectifier Tube : Do I Need This Thing?

I've had the same experience on a LSS, which uses a solid state rectifier on 30W mode, and tube rectifier on 5/15 watt mode. The first time my rectifier tube failed, I was on the 15 W mode, so I replaced the fuse and switched to the 30W mode. Within 10 minutes the fuse blew again. I pulled the recti...
by ricardo loma vista
Tue Mar 01, 2011 12:11 am
Forum: Lonestar Series
Topic: Mesa Lonestar Special Channel 2 just died
Replies: 3
Views: 487

Re: Mesa Lonestar Special Channel 2 just died

sounds like a bad switch--should be a relatively easy fix
by ricardo loma vista
Sun Feb 27, 2011 7:42 pm
Forum: Lonestar Series
Topic: Mesa Lonestar Special Channel 2 just died
Replies: 3
Views: 487

Re: Mesa Lonestar Special Channel 2 just died

Check to see if you are running channel 1 in 30 W mode and channel 2 in 15W or 5W mode. If so, then it's most likely your rectifier tube.
by ricardo loma vista
Fri Dec 10, 2010 8:40 pm
Forum: Lonestar Series
Topic: Solo function problem with LSS
Replies: 6
Views: 585

Re: Solo function problem with LSS

Make sure your FX loop is "on"

However, it's probably your cable. You can check by pulling the cable out to the 1st notch on the footpedal. If the cable is bad, the solo function will work but channel change will not.
by ricardo loma vista
Wed Dec 01, 2010 11:45 pm
Forum: Lonestar Series
Topic: Used LSS came with NOS Mesa Rectifier Tube
Replies: 1
Views: 355

Re: Used LSS came with NOS Mesa Rectifier Tube

That's a genuine NOS JAN Phillips that you have. Mesa sold Mesa-branded NOS 5Y3's for a while before "running out" of them according to the Mesa rep I talked to a few years back. Your link says that the Mesa 5Y3 is a "true, authentic 5Y3 NOS (New Old Stock) equivalent" with "equivalent" being the ke...
by ricardo loma vista
Wed Dec 01, 2010 11:18 pm
Forum: Lonestar Series
Topic: Lonestar Special
Replies: 17
Views: 5894

Re: Lonestar Special

Don't let rectifier tube stories scare you too much. The earlier models do have a tendency to blow the Mesa branded Sovtek 5Y3's. I have a 2005 model and blew a couple before switching to an NOS JAN Philips 5Y3. No problems at all since then. Even if the rectifer tube blows, you can still use the am...