Welcome, Guest. Please login or register.
January 21, 2018, 02:28:03 PM
Home Help Search Login Register
News: Ceriatone Forums are up and running!!!
 
Guests please register
Note: If you want to help you can donate to keep the forums alive.










Do you want to advertise on this forum ? Send me a private message.



 


Amplified Parts
+  Ceriatone Forum
|-+  Custom amp building, Prototypes and other amps
| |-+  Mods and Tweaks
| | |-+  Modded a Plexi 50
« previous next »
Pages: [1] Go Down Print
Author Topic: Modded a Plexi 50  (Read 11876 times)
ORourke
Newbie
*
Offline Offline

Posts: 6


View Profile
« on: October 25, 2010, 03:14:04 PM »

I picked up a Ceriatone 1987 plexi copy about a month ago. It was pretty good stock but I wanted to mess with it a bit. I emailed Dave Woodhouse at Baron Amps asking what he would recommend for an FX loop, he answered and then followed up with another email asking how far I wanted to take it mod-wise and that he had some ideas. Answer was, pretty far.  Wink  Dave was kind enough to draw up a layout to mod the amp and walk me through the whole thing, can't thank him enough for his help on this project.  Cool I'm still a novice for sure but I learned a ton from him and the resources he pointed me to, this was definitely a great learning project for me.





The amp now has two switchable gain modes, 2 stage Plexi-ish and a 3 stage high gain, master volume, presence, thrust and chunk controls and a 3-way bright switch on the gain pot. Sounds freaking amazing now IMHO. The clips are straight off my DR07. They don't really capture the tone as well as a proper recording setup would but I don't have one so this is what you get-  Grin

High gain mode with the gain up a bit
High gain mode with the gain down
Plexi mode

The amp cleans up really well now with the guitar volume, all those are straight into the amp with no pedals in front and just rolling back the guitar's volume pot for cleans. Really happy with the way it came out, thanks again to Dave for the layout, advice and answering all my dumbass newb questions  Embarrassed, Randy at Vintage Amp Repair and Eric Hellstyle on here for their input and Paul Kress for a killer job on the headshell. Much appreciated guys!  Cool
Logged
hywelg
Hero Member
*****
Offline Offline

Posts: 904


View Profile
« Reply #1 on: October 30, 2010, 07:23:58 AM »

Love the second clip, gain down a bit and the Plexi , boy I bet that was loud. My Plexi50 is soooo loud when crunching like that, I can't hardly ever use it. I've got Powerscaling fitted but some of the response and clarity goes when throttled back. Are you able to have it exactly as original in any of the modes you now have?

I'd love to see what the mods were, I guess its some sort of cascade V1a into V1b? Did you go ahead with a loop? I can't see an jacks.

Logged
ORourke
Newbie
*
Offline Offline

Posts: 6


View Profile
« Reply #2 on: November 03, 2010, 05:12:19 PM »

No loop, guy I got it from said it was ordered with one but not installed. Might do that down the road but not sure if I've got room for something pedal friendly like the iron sounds kit in the smaller 50 watt chassis. Also, I forgot to thank Nik for answering my questions, he identified the amp and original mod which was the one wire mod on a switch and gave me some pointers on tweaking it before I did this latest project.

It's 3 stages cascaded plus a cathode follower, the "plexi" mode switches out the second gain stage and isn't a Plexi circuit wise but the gain level and tone are pretty close. Master volume is active in both modes so you can get those Plexi tones at lower volumes, although it sounds better cranked up of course. Neither mode is the same as the original anymore, whole different animal now.  Grin

I've added a couple things since, a switch to raise the second stage's cathode bypass cap value for more thump and a switch to drop the second stage grid resistor's value for a touch more gain and a mid boost. Waiting on some diodes in the mail to add a Jose-style clipping circuit switchable on a push-pull pot too.

Love playing with this thing, it sounds killer and the turret board lets you try out a bunch of different stuff.
Logged
lynchmob666
Newbie
*
Offline Offline

Posts: 1


View Profile
« Reply #3 on: December 21, 2010, 07:06:45 PM »

Those clips are great!  How in the world did you get Dave to share the info for that mod?!  Usually info like that is guarded like crazy. 
Logged
verderacer
Newbie
*
Offline Offline

Posts: 1


View Profile
« Reply #4 on: December 21, 2011, 08:45:56 PM »


I just get here and this is exaclty what kind of info I am looking for and the pics are gone?!?!...

please repost !

Logged
Pages: [1] Go Up Print 
« previous next »
Jump to:  


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.12 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!

CeriaTone Forum is not afiliated with Ceriatone Amplifications. The CeriaTone and name, logo and related trademarks and service marks, owned by CeriaTone. , are registered and/or used in the U.S. and many foreign countries. All other trademarks, service marks, and trade names referenced in this site are the property of their respective owners.