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Amplifier Discussion / Re: Vox Pathfinder 10 mods
« Last post by blackcorvo on Today at 02:20:12 AM »
j_flanders, thanks again for the photo of the board. I decided to do a simple diagram on it of how to do the mod. I'll leave the coupling cap and bass pot I changed out of it, as I don't think it changes much in regards to the overall response of the amp.
I decided to recommend removing R8 along with the Red LEDs, as I think it muffles the amp too much.

https://imgur.com/qZBD5JF
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The speaker I used is 8 Ohms, rated at 2.5 Watts. The output transformer was made to order from a brazillian transformer manufacturer (http://schatz.eng.br/), 3k:8R/4R, with bass response starting at 120Hz (due to the space I had available).
I have a switch on the speaker output to change from the 4R to the 8R tap, but looking back at it, I could probably fit 2x switching jacks in there and a larger O.T., no problem. Specially now that I got some 3" alnico speakers off eBay, with much smaller magnets.

I just need to find another fried Honeytone! :P
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Preamps and Effects / Re: Noisy EFF board from a Roland JC-120G
« Last post by joecool85 on April 16, 2019, 01:58:30 PM »
Sounds like the effects board is picking up and amplifying stray RF signals.  Is the board properly grounded?
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Schematics and Layouts / Re: Univox Stage 65b
« Last post by Sfmag1 on April 12, 2019, 05:45:51 AM »
Ok man great thanks Drgonz78! 
For some reason the pics were not showing up last time I visited that post. Some of the components are different, as is the layout but it is very close. I will try to modify that schem to show the bass version and then post it here. And thanks to the person who made the jpegs. :dbtu:
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Preamps and Effects / Noisy EFF board from a Roland JC-120G
« Last post by Phil_Pop on April 08, 2019, 09:25:11 PM »
I friend sent me a Roland JC-120G with only one working channel, I fixed the bad channel "just a blown fuse" I also notice
what sounds like an AM radio coming from the speakers when the EFF Board is installed in the amp.

Does any one have a schematic for the EFF board? the AMP serial number is Z9G1267.

Looks like the EFF board's number is E74366.


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Amplifier Discussion / Re: Crate gx900h
« Last post by Amdthedestroyer on April 04, 2019, 05:38:16 PM »
Good point. If it aint broke, dont fix it. I do really like it and I would hate to break it doing something unnecessary.
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Schematics and Layouts / MOVED: New version of DIY Layout Creator
« Last post by joecool85 on April 03, 2019, 10:43:53 AM »
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Software / Re: DIY Layout Creator
« Last post by joecool85 on April 03, 2019, 10:42:52 AM »
Bringing this topic back from the dead as I just revived the software myself on my Linux box.  It still works great!  Thanks Bancika!
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Amplifier Discussion / Stramp hybrid schematics anyone?
« Last post by ilyaa on April 02, 2019, 01:01:40 PM »
hey!

recently came across a crazy old gem -

a Gun (United Sound Company) Lead 200

it looks just like this: http://www.vintagemusicshop.sk/?p=67295

with some researched i figured out its a later model Stramp - apparently, after he sold Stramp to Dynacord - because mine is a solid state preamp and tube power amp (with a tube PI). 100W 4xEl34 power section

has anyone ever seen a schematic for this hybrid?? its in rough shape and id love to get it going....
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Amplifier Discussion / Re: Crate gx900h
« Last post by Enzo on April 01, 2019, 11:16:12 PM »
I think any amp that has worked for 20 years or more has already demonstrated reliability.
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Vox Pathfinder 10 mods by blackcorvo
[Today at 02:20:12 AM]


Honeytone Tube conversion using subminiature tubes by blackcorvo
[Today at 01:44:00 AM]


Noisy EFF board from a Roland JC-120G by joecool85
[April 16, 2019, 01:58:30 PM]


Univox Stage 65b by Sfmag1
[April 12, 2019, 05:45:51 AM]


Crate gx900h by Amdthedestroyer
[April 04, 2019, 05:38:16 PM]

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