What kind of mods would I have to do to get more clean headroom out of it? I listened to the demo and it sounds awesome!.. just not much room for good clean tones.
@HellBent1337 #1 use a hammond 125ese output transformer #2 raise the pre amp plate voltages #3 use a very efficient speaker ... there is not a lot you can do with a single ended 4 watt amp ... just like you cant make a motorcycle a good dump truck LOL
@patfurlan This might seem like a dumb question to you, however it would be an insightful answer to me: To increase the pre amp plate voltage do I increase the resistor that is grounding?
---You do enough modding to a motorcycle, I'm sure you could do some decent hauling of garbage :)
Hey Thanks for the video I did some of the mods on my VJ along with a few I got off the SEwatt bulletin board took a muddy flat sounding amp to something amazing. Thanks for the video It help gave me the courage to mess with mine.
Great sound Pat. I bought one of these amps just to do this mod. Can you tell what the watt values are for the resistors? I used 1/2 watt for everything, but I don't know what the wattage is for R13. I don't know where to get a magic mustard cap....Are you using a Mallory in C2 and would that work in C1? Is C4 .68 or 68?
I've down similar mods on my EVJ with the same solder iron. I've found that the tip of that model to be to bulky for anything else. I totally killed a DS-1 pedal trying to do a keeley mod. So just a word to the wise for anyone out there, buy your iron from Radio Shack and not Lowe's as I did. Otherwise great video, I wish this was around when I messed with mine in February.
I'm very careful not to overheat the connections & prefer the higher wattage to work faster. Yo want to make sure you have good technique and maintain the tip carefully.
What kind of mods would I have to do to get more clean headroom out of it? I listened to the demo and it sounds awesome!.. just not much room for good clean tones.
HellBent1337 6 days ago
@HellBent1337 #1 use a hammond 125ese output transformer #2 raise the pre amp plate voltages #3 use a very efficient speaker ... there is not a lot you can do with a single ended 4 watt amp ... just like you cant make a motorcycle a good dump truck LOL
patfurlan 6 days ago
@patfurlan This might seem like a dumb question to you, however it would be an insightful answer to me: To increase the pre amp plate voltage do I increase the resistor that is grounding?
---You do enough modding to a motorcycle, I'm sure you could do some decent hauling of garbage :)
HellBent1337 4 days ago in playlist Amps
@HellBent1337 no you are adjusting the resistors between the power supply caps that step the voltage down from the power amp.
patfurlan 4 days ago
what brand of power capacitors did you use for the 47 mfd? Also, was it at 500 volts?
jonbehert 1 week ago
@jonbehert the amp runs at 300 volts but I used 450 volt caps for all power supply work
patfurlan 1 week ago
Found it!
shaindaman13 4 months ago
Why didnt you unplug the board and get it out of the case?
eRealist 4 months ago
@eRealist because I had enough room to work & it was much faster to flip it down again and listen to the change
patfurlan 4 months ago
@eRealist Stupid Question. Did you post part II of this video? I cannot find it.
shaindaman13 4 months ago
@shaindaman13 yes just click on the side bar of uploaded videos its right there
patfurlan 4 months ago
Hey Thanks for the video I did some of the mods on my VJ along with a few I got off the SEwatt bulletin board took a muddy flat sounding amp to something amazing. Thanks for the video It help gave me the courage to mess with mine.
NostalgiaT 4 months ago
Just did these mods - sounds great!
yokel999 9 months ago
all resistors are 1/2 watt & in the end all caps were mallory 150 series
patfurlan 1 year ago
Great sound Pat. I bought one of these amps just to do this mod. Can you tell what the watt values are for the resistors? I used 1/2 watt for everything, but I don't know what the wattage is for R13. I don't know where to get a magic mustard cap....Are you using a Mallory in C2 and would that work in C1? Is C4 .68 or 68?
Flowingmonkey 1 year ago
I've down similar mods on my EVJ with the same solder iron. I've found that the tip of that model to be to bulky for anything else. I totally killed a DS-1 pedal trying to do a keeley mod. So just a word to the wise for anyone out there, buy your iron from Radio Shack and not Lowe's as I did. Otherwise great video, I wish this was around when I messed with mine in February.
guycalleddave 1 year ago
OK I'll admit I buy cheap soldering Irons ...
Guilty as charged
I'm very careful not to overheat the connections & prefer the higher wattage to work faster. Yo want to make sure you have good technique and maintain the tip carefully.
patfurlan 1 year ago
@patfurlan Better still get a weller
djworrall 6 months ago
@djworrall just like guitar ...its the technique not the tools ... but seriously yes, invest in a good Iron
patfurlan 6 months ago
C1 = .01, C2 = .02 , r6 = 10k, r 7 delete, r15 = 150k, R5 = 330k , C3 = remove & connect Feedback 3 meg @ 4 ohm, Power supply C6 = c9 47mfd, R13 = 4.7k optional c4 + 220 mfd (bfg), or .68 early (VH) for super lead type tone C1 +.002 dial in to suit
patfurlan 1 year ago
r6 is replaced with a wire or a resistor of 10k or less to prevent squealing
R7 is also removed
patfurlan 1 year ago
I was going to do a bitmo mod, but I think I like this one better - more organic. Do you have a spec sheet/ parts list available?
usevansb 1 year ago
I'll post a parts list an a couple of days I'm away on Business. If you want big loud and clear order the hammond 125ese output transformer.
If you want lots of dirt keep the stock OT. I use the 125ese as I gig with this amp.
patfurlan 1 year ago