Search found 360 matches

by ja22y
Thu Nov 08, 2012 6:48 pm
Forum: Lonestar Series
Topic: LSS Rectifier Issue - Info
Replies: 5
Views: 4002

Re: LSS Rectifier Issue - Info

Power tube red plating has little to to with rectifier tube. However you can try to see if it's a bad tube or a bad tube position. Use a tube from another socket that does not red plate and swap that into the trouble socket. If it doesn't red plate then it's the tube. If it's red plated then most li...
by ja22y
Fri Mar 23, 2012 3:55 pm
Forum: Lonestar Series
Topic: Ch2 50W vs 100W LSC tightness - a difference, or just me?
Replies: 5
Views: 2391

Re: Ch2 50W vs 100W LSC tightness - a difference, or just me?

The output impedance changed when going from 100w to 50w. So if you leave the speaker plugged in the same jack, that's an output mismatched (with your speaker) that you hear.
by ja22y
Fri Mar 23, 2012 3:48 pm
Forum: Lonestar Series
Topic: To mod or not to mod...?
Replies: 24
Views: 4075

Re: To mod or not to mod...?

Thanks Chris. Much appreciated. I have actually, just two weeks ago, soldered bright caps (250pf Silver Mica) across the drive pot and both channel gains. Probably a bit OTT, (may substitute the 250pf for 150pf) but its great having to tame the highs rather than to try to coax them from nowhere. I ...
by ja22y
Tue Jan 03, 2012 2:32 pm
Forum: Lonestar Series
Topic: LSS Rectifier Issue - Info
Replies: 5
Views: 4002

LSS Rectifier Issue - Info

I've not been on this board for a while thought I stop by. I still see a lot of question regarding the rectifier issue/fix. The official Mesa fix is to snip off the two 470 ohm (R101 R103) located on either side of the ribbon cable connecting the main board to the small power board on the back. What...
by ja22y
Fri Feb 04, 2011 11:06 am
Forum: Lonestar Series
Topic: Lonestar bias mod
Replies: 78
Views: 26253

Re: Lonestar bias mod

Glad it worked out for you.
Not sure why Mesa biased the LSC way cold and the LSS way hot (115%!!!).
by ja22y
Mon Jan 31, 2011 12:34 am
Forum: Lonestar Series
Topic: Lonestar bias mod
Replies: 78
Views: 26253

Re: Lonestar bias mod

I suggest that you do some research on the biasing topic so that it will make more sense, there are a few good ones: http://www.aikenamps.com/Biasing.html The bias probe gives you the cathode voltage across a 1 ohm resistor, since I=V/R, you can considered the multimeter reading is the cathode curre...
by ja22y
Sun Jan 30, 2011 2:18 pm
Forum: Lonestar Series
Topic: Lonestar bias mod
Replies: 78
Views: 26253

Re: Lonestar bias mod

Hi everyone, Ive had my mod kit laying arround for a while and finally got round to installing it (well nearly) I got me a multimeter and bias prob and decided to take a reading before doing the mod. All 4 valves are reading arround 27mA when in 100w mode but drop all the way down to arround 15mA w...
by ja22y
Wed Jan 26, 2011 6:47 pm
Forum: Lonestar Series
Topic: Loud, audible "pop" when switch from 5 to 15 watt mode.
Replies: 10
Views: 1444

Re: Loud, audible "pop" when switch from 5 to 15 watt mode.

I don't know what it is that Mesa changed in the LSS after that, but "apparently it fixed the problem, They remove 2 resistors to make the tubes run slightly less hot. Your tech should be able to verify this when he has the amp open. Also ask the tech to measure the screen grid resistors on the pow...
by ja22y
Wed Jan 26, 2011 12:17 pm
Forum: Lonestar Series
Topic: Loud, audible "pop" when switch from 5 to 15 watt mode.
Replies: 10
Views: 1444

Re: Loud, audible "pop" when switch from 5 to 15 watt mode.

I don't know what it is that Mesa changed in the LSS after that, but "apparently it fixed the problem, They remove 2 resistors to make the tubes run slightly less hot. Your tech should be able to verify this when he has the amp open. Also ask the tech to measure the screen grid resistors on the pow...
by ja22y
Fri Jan 14, 2011 2:54 pm
Forum: Lonestar Series
Topic: My LSS Problem: UPDATE
Replies: 11
Views: 1133

Re: My LSS Problem: UPDATE

I took my amp to get looked at last week. I received a phone call from the store yesterday. The tech told me that my power transformer shorted out. He said he didn't know if that would be covered under the warranty. The tech said he would contact Mesa and then get back to me. Have the tech replace ...
by ja22y
Mon Dec 27, 2010 1:34 am
Forum: Lonestar Series
Topic: Finally tried the Lonestar Special today - qeustion
Replies: 9
Views: 843

Re: Finally tried the Lonestar Special today - qeustion

Different setting opinions here are telling you that the LSS is very versatile and many tones can be dialed in to your taste. If it sound right to you then it's right. But in general it gets darker as you turn up the gain and brighter as you turn up the drive.
by ja22y
Mon Dec 27, 2010 1:18 am
Forum: Lonestar Series
Topic: Mesa LSS and Fender PRRI comparison (video)
Replies: 19
Views: 2176

Re: Mesa LSS and Fender PRRI comparison (video)

Nothing like seeing a couple amps under a Xmas tree. For low volume like in the clip, I think both amps sounded good. I think that the prri will falter when you push it a little, it just won't have any mid for crunch.
by ja22y
Mon Dec 27, 2010 12:55 am
Forum: Lonestar Series
Topic: New lonestar owner with a question...
Replies: 2
Views: 394

Re: New lonestar owner with a question...

Power tube life is the same regardless what mode you're in, tube life depends more on how hot the tube is biased. However if you'r on the 10w all the time then obviously that one tube will wear out faster. In that case just rotate the tube every so often. Stock LSC, people have reported that the amp...
by ja22y
Mon Dec 27, 2010 12:19 am
Forum: Lonestar Series
Topic: 4 those who did the drive sw mod, what ft switch do you use?
Replies: 8
Views: 572

Re: 4 those who did the drive sw mod, what ft switch do you use?

It took me awhile but I finally figured it out. Thought that a ft sw to ground is a simple thing, not quite. Here's the scoop: The reason that only a certain ft sw works is that the ft sw is used to activate a relay (the LS(S) is full of them) and in turn the relay does the actual switching. The rel...