Search found 91 matches

by thom
Sat Mar 02, 2013 4:51 pm
Forum: Lonestar Series
Topic: LSC Bias Mod Kit?
Replies: 15
Views: 4591

Re: LSC Bias Mod Kit?

The amp bias does get hotter as you raise the resistance, hence if the pot goes open circuit, (infinite resistance) you will blow the output tubes. That is why putting a resistor in parallel is advantageous as you can put a lower value resistor in parallel, (which is why the Mansfield kit used a 3....
by thom
Thu Feb 28, 2013 3:32 pm
Forum: Lonestar Series
Topic: LSC Bias Mod Kit?
Replies: 15
Views: 4591

Re: LSC Bias Mod Kit?

Well after some more reading of my own I would agree some of my thinking was not correct, but I wasn't really off on what you are pointing out. That said, you are not incorrect about using a resistor in parallel to the pot. You can use a higher value pot and put a resistor in parallel. You can also...
by thom
Thu Feb 28, 2013 2:24 pm
Forum: Lonestar Series
Topic: LSC Bias Mod Kit?
Replies: 15
Views: 4591

Re: LSC Bias Mod Kit?

That's correct, Nitrous. The resistor on the Mansfield board appears to be a 3.9K resistor. However, I understand what you are saying. Using a 10K fixed resistor and a 10K(minimum) pot would give me a starting resistance of 20K. Just a word of caution. I am no expert and haven't tried this kind of ...
by thom
Sat Apr 14, 2012 3:48 am
Forum: Lonestar Series
Topic: LSS - Couple of Issues - rattle and crackle/sound loss
Replies: 8
Views: 1157

Re: LSS - Couple of Issues - rattle and crackle/sound loss

I would retube if it was me. LSS is cathode biased so you should be OK. If in doubt buy Mesa El84s, or tell your supplier you want Mesa compatible tubes. Picky detail, but isn't the LSS fixed bias like the LSC? Pretty sure it is... in which case you do need to be conscious about what you put in the...
by thom
Tue Apr 10, 2012 3:29 pm
Forum: Lonestar Series
Topic: LSS - Couple of Issues - rattle and crackle/sound loss
Replies: 8
Views: 1157

Re: LSS - Couple of Issues - rattle and crackle/sound loss

I would retube if it was me. LSS is cathode biased so you should be OK. If in doubt buy Mesa El84s, or tell your supplier you want Mesa compatible tubes. I would also consider getting a couple of pre amp tubes and try swapping out to see if the crackle goes away. Another thing to try tube wise, is s...
by thom
Sat Mar 24, 2012 6:19 am
Forum: Lonestar Series
Topic: To mod or not to mod...?
Replies: 24
Views: 4374

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 thom
Sun Mar 18, 2012 3:45 am
Forum: Lonestar Series
Topic: LSS 15 & 5w mode problem
Replies: 1
Views: 784

Re: LSS 15 & 5w mode problem

Yes, most likely the rectifier tube has failed. Seems to happen a lot. There is a mod (use the search function here) to help prevent this happening. The mod should have been applied to later models (serial numbers over 4000 I think). Having said all that my LSS is old, Sn <1000 does not have the mod...
by thom
Fri Mar 16, 2012 2:49 pm
Forum: Lonestar Series
Topic: To mod or not to mod...?
Replies: 24
Views: 4374

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

Hello Tom. Sorry for the slow response. I have not been visiting the Boogie Board very often lately and just saw your message. Find the schematics for the Mark V and Lonestar on the web and compare the CH 2 signal paths. They are almost identical in the preamps. The EDGE mode in the Mark V adds a 5...
by thom
Sat Feb 25, 2012 3:04 pm
Forum: Lonestar Series
Topic: Lone Star Classic Combo Caster Question
Replies: 12
Views: 1605

Re: Lone Star Classic Combo Caster Question

My castor that came with my Lonestar classic is different than that pic. Mine has the dent but the middle has a round part that comes up even with the rest of the base that does not allow the button to go in the dent. I would maybe try a thin metal shim to cover the indent . I have a pic of mine on...
by thom
Sat Feb 25, 2012 2:57 pm
Forum: Lonestar Series
Topic: Lone Star Classic Combo Caster Question
Replies: 12
Views: 1605

Re: Lone Star Classic Combo Caster Question

To the OP, my castors slide on and off quite easily, no force required. tle4, to post pics you need to upload them to a photo sharing site. I use photobucket. When you have them uploaded you simply click on the share image link, and paste the link into your post. My castors do look a bit different t...
by thom
Sat Feb 25, 2012 5:56 am
Forum: Lonestar Series
Topic: Lone Star Classic Combo Caster Question
Replies: 12
Views: 1605

Re: Lone Star Classic Combo Caster Question

Hope these pics help. A bit blurry as I don't have my 'good' camera to hand at the moment. The 'plates' on the castors are 2mm thick btw.

Image

Image
by thom
Sun Feb 19, 2012 6:23 am
Forum: Lonestar Series
Topic: What od/dist pedal have you tried with the LSS?
Replies: 4
Views: 1193

Re: What od/dist pedal have you tried with the LSS?

I use a Wampler Superplex with my LSS. I find I need to have the treble quite high and the mids and bass low, (I am talking about the pedal controls here, though the same could be said about the amp controls) but it i sounds very good fo higher gain tones. For more restrained tones the Wampler Ecsta...
by thom
Sun Feb 19, 2012 5:06 am
Forum: Lonestar Series
Topic: Lone Star Classic Combo Caster Question
Replies: 12
Views: 1605

Re: Lone Star Classic Combo Caster Question

My LSS came castorless. I eventually found someone selling sets on ebay. They only had a limited amount and pretty sure they all got sold. I ended up with a set with 3" diameter wheels. Judging by photos I have seen this is larger than would normally be supplied and I think that is no bad thing. The...
by thom
Sun Feb 05, 2012 5:13 am
Forum: Lonestar Series
Topic: To mod or not to mod...?
Replies: 24
Views: 4374

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

3. Bypass the 220 k resistor that feeds stage 2 (drive stage) of Channel 2 with a 470 pF capacitor. This copies the Channel 2 "Edge" mode of the Mark V, if you happen to like this sound, which is a brighter distortion useful for on-the-verge of breakup sounds. Chris (or anyone else!), do you know w...
by thom
Tue Nov 29, 2011 12:10 pm
Forum: Lonestar Series
Topic: help with my lonestar special 1x12
Replies: 10
Views: 1927

Re: help with my lonestar special 1x12

My LSS is quite an old one having a serial number in the 900s. The rectifier tube is a Jan Phillips, (stamped with Mesa on the glass) which I believe to be an older tube made to military standards, and of better quality than new production tubes. I have had the amp for about 3 years with no issues. ...