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PEAVEY Mark III vs Mark IV

Revived Zombie Thread.
I played Top 40/Hard Rock/Soft Rock/Disco/Pop. Bought my rig early 80's and it's still running very well although I only ever use it for larger gigs now. Gigged for close to 30 years using a '91 Peavey Dyna Bass 5 string through it, the DDT compression light would come on constantly through the second half of a gig when the volume went up but it was more of a limiter for the speakers, and although it did limit any extra volume the darn thing was loud, loud, loud anyway, so any extra volume was generally never needed.
The 1820 cab was a 4ohm and it was the only cab I ever ran with the MKIV head, so 210watts was all I drove through it into the 1820 cab and never hooked in a second cab to gain the full 300w at 2ohms. I never used the channel combiner pedal. I ran both A and B channels on all the time so never needed turning a channel off. The cable was too short anyway and it plugged to the amp using a din type plug which to my way of thinking was too fragile (see pic).
I ran channel A gain about 9 oclock and Master flat out, bass (Low) 3, mid 12, high 2
I ran channel B gain at 12 oclock and Master flat out, bass (Low) 3, paramid 2, shift 1.5K, high 2
Both Bright and Graphic buttons engaged for channels A and B. Graphic EQ 3 sliders on Low side quite high (check pic) Graphic EQ 3 sliders on High side high also (check pic).
I ran this MKIV head at these settings for more than 30 years without a hiccup and had volume to die for at all those settings at any size gig.
I plugged into the Low Gain input with the Active Dyna Bass. I never used the effects loop. I ran the Peavey Dyna Bass 5 string using one guitar cable into a Boss Bass Flanger, Boss Bass Touch Wah, Boss Bass Chorus daisy-chained and straight from the last pedal output using a second guitar cable into the Low Gain MKIV Head input. I got a great sound using that system in that fashion. The High gain input was useful with passive basses like my Ric 4003.
Never used FOH. This amp covered large venues of 1500+ people with ease.
The rig is still a working musicians rig..reliable, flexible, clean sounding and gutsy.
1820 rear cab.JPG
PEAVEY MK IV HEAD PEAVEY 1820 CAB.jpg
MKIV Head Settings.JPG
 
I wouldn't worry about the DDT circuit at all. It isn't a compressor as much as a limiter and you don't hear it working, just the occasional flash when it kicks in. You may reach that point more often with your volume/low-end pumping hard and if you expect or need proper compression I would suggest using a pedal.

I have a Mark IIIB (no heatsink) with an like Peavey 1x15” BW (vertical silver stripes, no idea of the year, no info plaque on the back) and I’m pretty happy with it.

It does have noticeable squash in the tone with the DDT on though so I like to turn it on, set it up so it barely flashes, then turn it off. I wouldn’t want to not have the option of turning it off.

Mine is pretty clean till the preamp is at 8+ then it overdrives like mad.

Down at the local ma and pa there is a Mark IIIBH Musician (guitar amp version) modded for bass. Sounds pretty much the same.

I can’t answer anything about the footswitch due to having never used one.

All told. No regrets.
 
Thanks bigtone23.
Revived Zombie Thread.
I played Top 40/Hard Rock/Soft Rock/Disco/Pop. Bought my rig early 80's and it's still running very well although I only ever use it for larger gigs now. Gigged for close to 30 years using a '91 Peavey Dyna Bass 5 string through it, the DDT compression light would come on constantly through the second half of a gig when the volume went up but it was more of a limiter for the speakers, and although it did limit any extra volume the darn thing was loud, loud, loud anyway, so any extra volume was generally never needed.
The 1820 cab was a 4ohm and it was the only cab I ever ran with the MKIV head, so 210watts was all I drove through it into the 1820 cab and never hooked in a second cab to gain the full 300w at 2ohms. I never used the channel combiner pedal. I ran both A and B channels on all the time so never needed turning a channel off. The cable was too short anyway and it plugged to the amp using a din type plug which to my way of thinking was too fragile (see pic).
I ran channel A gain about 9 oclock and Master flat out, bass (Low) 3, mid 12, high 2
I ran channel B gain at 12 oclock and Master flat out, bass (Low) 3, paramid 2, shift 1.5K, high 2
Both Bright and Graphic buttons engaged for channels A and B. Graphic EQ 3 sliders on Low side quite high (check pic) Graphic EQ 3 sliders on High side high also (check pic).
I ran this MKIV head at these settings for more than 30 years without a hiccup and had volume to die for at all those settings at any size gig.
I plugged into the Low Gain input with the Active Dyna Bass. I never used the effects loop. I ran the Peavey Dyna Bass 5 string using one guitar cable into a Boss Bass Flanger, Boss Bass Touch Wah, Boss Bass Chorus daisy-chained and straight from the last pedal output using a second guitar cable into the Low Gain MKIV Head input. I got a great sound using that system in that fashion. The High gain input was useful with passive basses like my Ric 4003.
Never used FOH. This amp covered large venues of 1500+ people with ease.
The rig is still a working musicians rig..reliable, flexible, clean sounding and gutsy.
View attachment 3672245 View attachment 3672243 View attachment 3672244
My Gosh,I wish i never sold mine.I had the exact same set up as you from 1982 to 2008 .It kicked butt anywhere.I may have to buy another used mk 4 head.Even my new 250 max isnt quite the same.My mk 4 had scratchy pots at the end,but wow what a performer.I used 2, 4 ohm 15 in BW speakers in parallel in a single cab I made to get 300 watt output.Caused some earth quakes with that set up LOL
 
hello zombie thread. it’s a simple procedure to “upgrade” an early mk3 to the 400bh heat sink module so the amp will do 300 watts into 2 ohms.
any xr600b or xr600c PA head has the 400bh power section, and they can often be found “not working” or for parts very cheaply.
swap the 400bh from the PA into your non heat sink model and you have a better bass amplifier for an hour of work.
the 400b power section does work fine but the later bh design is optimized. the 6352 transistors are the same, but better cooling is an obvious improvement.
 
I cant make any class D amp sound as deep and clean as my old Peavey Mark IV.Is that because it was a class AB amp?Im curious

I think the controls were designed to make it easy to adjust to the room you are playing in. I fried my Mark iv two weeks ago during rehearsal : (

But the Mark III next to it got me through the rest of the day.

IMG20221022103539.jpg
 
  • Like
Reactions: Count Bassie
I cant make any class D amp sound as deep and clean as my old Peavey Mark IV.Is that because it was a class AB amp?Im curious

This goes deep and sounds clean on one channel, and the other channel gets drive added to allow me to be heard. Not as intuitive to dial in, but once dialed with it's 3000 watts is for me like having the Mark IV but on steroids. The Mark IV is really awesome between it's controls and not needing a fan.

IMG20221022113419.jpg

IMG20221022110128.jpg
 
  • Like
Reactions: Heavy Blue
hello zombie thread. it’s a simple procedure to “upgrade” an early mk3 to the 400bh heat sink module so the amp will do 300 watts into 2 ohms.
any xr600b or xr600c PA head has the 400bh power section, and they can often be found “not working” or for parts very cheaply.
swap the 400bh from the PA into your non heat sink model and you have a better bass amplifier for an hour of work.
the 400b power section does work fine but the later bh design is optimized. the 6352 transistors are the same, but better cooling is an obvious improvement.
Nice!

My Mark III also had the 400BH power section with the near full width heat sink. I believe that I purchased it in early 1981.
Kim
Yeah, I prefer the MKIII, but also prefer the 400BH, that is the transitional model that I would jump on.
I cant make any class D amp sound as deep and clean as my old Peavey Mark IV.Is that because it was a class AB amp?Im curious
Well, the MKIV is a monster amp that has provided millions of hours of reliable and good sounding play for bassists over the last 40 years. It's sort of in the DNA of bassists now, like the SVT, GK, SWR, etc...
FWIW, class A/B amps do have a certain tonality and response to them. I know guitarists that like tube power amps (which are mostly A/B) like A/B solid state (particularly MOSFET) over D. D is efficient and lightweight, but convenience is not always the best choice when it comes to tone and feel.
 
Thread Drift: Are all those stompboxes in the back of your rack always on? If so, that's a brilliant way to mount/store them and keep them out of the way!
If not, what are you using to remotely access them?
thx

It makes it really convenient to show up at rehearsal and just plug in speakers, bass, and power. Everything is Velcro'd in place.

Reverb, Octave, and EQ always on for amp channel A (with for now built in fixed HPF on at 100) which carries the SansAmp Drive circuit into two 15" JBL E140-8's. Amp channel B is clean and deep with variable HPF always on set around 40, LPF around 2200, with gain, driving two 18" JBL 2240H's.

We went from can barely hear the bass to making adjustments for how we want it to sound, was like the difference between night and day.

Eventually will add some switching using the effects loop built into the Sansamp RPM, but for this band there seems no need.

Just have to be heard and felt. Started playing bass in 1985 and have never needed or used effects till now, luckily, the two guitarist's are running basically clean Gibson sound, so I have some room to work with effects to help stand out in the mix. Rack currently weighing in at 38lbs, so not bad : ) Just about the weight of the Subway 115.

IMG_20221025_134552.jpg
 
Last edited:
Revived Zombie Thread.
I played Top 40/Hard Rock/Soft Rock/Disco/Pop. Bought my rig early 80's and it's still running very well although I only ever use it for larger gigs now. Gigged for close to 30 years using a '91 Peavey Dyna Bass 5 string through it, the DDT compression light would come on constantly through the second half of a gig when the volume went up but it was more of a limiter for the speakers, and although it did limit any extra volume the darn thing was loud, loud, loud anyway, so any extra volume was generally never needed.
The 1820 cab was a 4ohm and it was the only cab I ever ran with the MKIV head, so 210watts was all I drove through it into the 1820 cab and never hooked in a second cab to gain the full 300w at 2ohms. I never used the channel combiner pedal. I ran both A and B channels on all the time so never needed turning a channel off. The cable was too short anyway and it plugged to the amp using a din type plug which to my way of thinking was too fragile (see pic).
I ran channel A gain about 9 oclock and Master flat out, bass (Low) 3, mid 12, high 2
I ran channel B gain at 12 oclock and Master flat out, bass (Low) 3, paramid 2, shift 1.5K, high 2
Both Bright and Graphic buttons engaged for channels A and B. Graphic EQ 3 sliders on Low side quite high (check pic) Graphic EQ 3 sliders on High side high also (check pic).
I ran this MKIV head at these settings for more than 30 years without a hiccup and had volume to die for at all those settings at any size gig.
I plugged into the Low Gain input with the Active Dyna Bass. I never used the effects loop. I ran the Peavey Dyna Bass 5 string using one guitar cable into a Boss Bass Flanger, Boss Bass Touch Wah, Boss Bass Chorus daisy-chained and straight from the last pedal output using a second guitar cable into the Low Gain MKIV Head input. I got a great sound using that system in that fashion. The High gain input was useful with passive basses like my Ric 4003.
Never used FOH. This amp covered large venues of 1500+ people with ease.
The rig is still a working musicians rig..reliable, flexible, clean sounding and gutsy.
View attachment 3672245 View attachment 3672243 View attachment 3672244
Gonna give your settings a try. Ty!:thumbsup:

hello zombie thread. it’s a simple procedure to “upgrade” an early mk3 to the 400bh heat sink module so the amp will do 300 watts into 2 ohms.
any xr600b or xr600c PA head has the 400bh power section, and they can often be found “not working” or for parts very cheaply.
swap the 400bh from the PA into your non heat sink model and you have a better bass amplifier for an hour of work.
the 400b power section does work fine but the later bh design is optimized. the 6352 transistors are the same, but better cooling is an obvious improvement.
Good to know. I have a pretty good relationship with the local Peavey dealer. Maybe they'll have one of those old PA heads floating around.
 
hello zombie thread. it’s a simple procedure to “upgrade” an early mk3 to the 400bh heat sink module so the amp will do 300 watts into 2 ohms.
any xr600b or xr600c PA head has the 400bh power section, and they can often be found “not working” or for parts very cheaply.
swap the 400bh from the PA into your non heat sink model and you have a better bass amplifier for an hour of work.
the 400b power section does work fine but the later bh design is optimized. the 6352 transistors are the same, but better cooling is an obvious improvement.
I've just purchased a mk3 Centurion and while I love the tone I am concerned it won't be loud enough - is the 400BH plug and play, or are there directions somewhere?
 
I've just purchased a mk3 Centurion and while I love the tone I am concerned it won't be loud enough - is the 400BH plug and play, or are there directions somewhere?
Doesn’t increase the power into 8 or 4 ohms, that is dictated by the power supply itself.
 

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