D
Dyllheaven88
Well-known member
Anyone have the schematic for a hot rod 50 thanks !
fusedbrain
Well-known member
It's wired up like this.
The board NFB wire on the left lug of the pot is already present in the amp, and is connected to one of the impedance taps on the OHMS selector, or on the speaker jack. Install the pot and cap, move the NFB wire from the ohms selector to the left lug of the pot, and install a short wire as shown from the pot to the location where you removed the left wire from on the impedance selector.
I've owned both a HOT Rod 25 and an SLO100. The SLO came with a depth mod, and I installed one in the HR25. It sucked donkey balls in both amps and I removed it. On both amps, once they were at volume, adjusting the bass with the bass control sounded much better and tighter than turning the bass down and using the depth pot.
For low level home playing I can maybe see a use for the depth mod, but at band volume, both amps sounded better with it turned off and the bass control at about 6.
At a minimum, be prepared to mess with the cap value to get what you want. Mike always put .0047uf in the SLO's when he did the mod, but you may prefer a different value ( .0068uf or .0022uf for example ) . There are no rules.....
.0068uf moves the boost frequency lower, almost like sub-bass, and going up to .0033uf or .0022uf will start to add lower mids along with the bass boost.
Also note that the effect is cabinet and speaker dependent, as you are un-damping the speakers at low frequency. Speaker resonant frequency and cab geometry will play a large part in the end result, and may be why I hated it and some guys love it
The board NFB wire on the left lug of the pot is already present in the amp, and is connected to one of the impedance taps on the OHMS selector, or on the speaker jack. Install the pot and cap, move the NFB wire from the ohms selector to the left lug of the pot, and install a short wire as shown from the pot to the location where you removed the left wire from on the impedance selector.
I've owned both a HOT Rod 25 and an SLO100. The SLO came with a depth mod, and I installed one in the HR25. It sucked donkey balls in both amps and I removed it. On both amps, once they were at volume, adjusting the bass with the bass control sounded much better and tighter than turning the bass down and using the depth pot.
For low level home playing I can maybe see a use for the depth mod, but at band volume, both amps sounded better with it turned off and the bass control at about 6.
At a minimum, be prepared to mess with the cap value to get what you want. Mike always put .0047uf in the SLO's when he did the mod, but you may prefer a different value ( .0068uf or .0022uf for example ) . There are no rules.....
.0068uf moves the boost frequency lower, almost like sub-bass, and going up to .0033uf or .0022uf will start to add lower mids along with the bass boost.
Also note that the effect is cabinet and speaker dependent, as you are un-damping the speakers at low frequency. Speaker resonant frequency and cab geometry will play a large part in the end result, and may be why I hated it and some guys love it
Attachments
Smash
Hack
FusedBrain is spot on. I have an Avenger. Had a Slo also. The depth mod is superfluous unless you are playing at or under around 80 dbs. The way Soldano designed his amps, is that gain and volume both increase the low end
Omnipotent1
Active member
Uncle Smash would you buy an original SLO100 (pre bad- or does that even matter?) in today’s world? Or do you feel like they are past their time…
J
Jack Luminous
Well-known member
I'm not Uncle Smash but hell yes I'd buy an original SLO100 again and again.
Smash
Hack
If you are into metal, i would pass. I had a pre bad slo and it was boring. It was left in the dust by more modern amps.Uncle Smash would you buy an original SLO100 (pre bad- or does that even matter?) in today’s world? Or do you feel like they are past their time…
If you want a slo flavor, but better, go with the mesa dual rec. That thing is awesome alone, but in stereo with a wizard, mgl, or other uppermid focused amp...god status
dead-pan
Well-known member
They say a Recto is based on a SLO but IME they are completely different.
I love Rectos but they are different from one to the other and tubes really matter.
SLOs are very different for me. Crunch is pretty Marshall like and much lower gain than a Recto can do.
For liquid leads SLO would be my choice.
High gain destruction, Mesa.
Smash
Hack
Yes. I think they are completely different also.
Omnipotent1
Active member
Yeah I’m really wondering how it does the brutalz… I heard recordings back in the day that made me really interested in one. Also played one of the 30 watt reissues recently but it wasn’t for me.. I was curious how the originals are because I can grab one for around $3500 at the moment.. or potential trading.. lol However I already have 2 dual rectifier multiwatts & if they struggle keeping up with that thing I will probably pass. Thank you for the input,
I am curious about @Techdeth Hermansson Rectifier. Maybe I’ll bury my head in that rabbit hole. 
Omnipotent1
Active member
I am open to all opinions
thank you for replying. What is it that you admire about Mike’s creation? Also if you don’t mind me asking what kind of music do you primarily use it for?
Omnipotent1
Active member
Yeah I heard this too. I think Peavey also ripped off part of Mike’s design when they were building the 5150. This is a cool video featuring fluffy talking about the rectifier / SLO history:
Fast forward to timestamp 11:45, & let it ride. Some cool info there
J
Jack Luminous
Well-known member
I am open to all opinions
I like the tone, I like the feel under the fingers, the attack, the bounce, I like the headroom, how it cleans up with the volume knob, the way it doesn't fall apart when you turn it up, the voicing with a Les Paul etc. It works for everything. I use it for all styles of music. I played with one for the last two decades. Death-metal, heavy, blues, classic rock, funk, fusion whatever. It just works for my taste.
I also have a rev G Dual Rect from the mid 90s, two 2203 from the early 80s, a 70s Hiwatt DR103, a 70s silver face Vibrolux Reverb, various rack gear etc. I like big 100W heads with 4x12s. If I were to keep a single amp, it would be my SLO.