Welcome, Guest. Please login or register.
February 07, 2023, 04:31:16 AM
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
|-+  American Style
| |-+  5E3 Tweed Deluxe
| | |-+  What do I have here? Newb content...
« previous next »
Pages: [1] Go Down Print
Author Topic: What do I have here? Newb content...  (Read 5634 times)
LUSN
Newbie
*
Offline Offline

Posts: 10


View Profile
« on: December 06, 2008, 10:56:57 AM »

I am new to Ceriatone amps, just picked up a 5E3 used. Very nice, after putting the correct tubes in...

Question- I see the posts here about using 6L6 and the need for bigger iron. I wonder if this one already has it?

It has a Mercury Mag Tone Clone FTDP PT http://www.mercurymagnetics.com/images/transformers/schematics/PT/FTDP.pdf


 and a FTDO-59 OT http://www.mercurymagnetics.com/images/transformers/schematics/OT/FTDO-59.pdf

The OT says it will take 6L6, 6V6 and EL34?

I know that some other mod needs to be added, not sure how to tell if this is in place...
Logged
wyatt
Guest
« Reply #1 on: December 09, 2008, 05:33:01 AM »

You should be fine.

A real Tweed Deluxe power transformer only supplies 1.65A on the 6.3 current and 2A of the 5V (rectifier) current.  That MM you linked to (despite saying its a clone of a '54) states 4A's for each, which would be more than enough to run 6L6GC's in the amp and your rectifier of choice.  You may consider a SS rectifier to get the plate voltages up some to try can make some use of the extra power handling capabilities of 6L6GC's. 

The output transformer is their straight Tweed Deluxe OT, which is fairly small iron, it'll handle the 6L6's fine, but it's going to limit the power from them.  I have one sitting here at my desk, and it makes my original '60 Tweed Deluxe OT pretty much in every dimension.  BTW, it says it will handle 6V6, 6L6 and EL84, not EL34. 

So, there are two other things to consider,  2x6L6GC's will have a different primary impedance, which means a different secondary impedance, with 6L6GC's, the correct speaker load is 4 ohms (8 ohms with 6V6's/EL84's).  I wouldn't worry to much if you have a stock 8-ohm speaker, but a 4-ohm would give you a little more output.

Also, depending on plate voltage (and voltage from plate to cathode), you may have to switch out values in the bias circuit.  IIRC, you should be okay if you use a 5Y3 (buy NOS, new ones don't use the right voltages) for 6V6 and a 5SR4 or SS rectifier for 6L6GC's.  But without being able to check, I make no promises. 

If you want the fuller tone and smoother, less lo-fi breakup of a 6L6GC, you'll get that.

If you are looking for significantly more headroom, it's probably not going to be a big enough difference.  Maybe you'll coax 18 watts instead of 12, but at stage volumes, that's pretty nominal.  You'd have to try and get around 30 watts or so out of the amp to make a real noticeable different in headroom on stage.  And THAT would take bigger iron and higher voltages. 

So, not that I've bewildered you with details, short answer...you are safe to use 6L6's.  I would use them with a 5AR4 or SS rectifier, both so they bias better and you get higher plate voltages for more output.  Just keep an eye on you tubs to make sure they don't seem to be running incredibly hot ("redplating").
« Last Edit: December 09, 2008, 05:37:41 AM by wyatt » Logged
LUSN
Newbie
*
Offline Offline

Posts: 10


View Profile
« Reply #2 on: December 09, 2008, 04:04:07 PM »

Excellent answer, thanks. I am trying to get just a bit more clean volume out of it- it seems to be almost full out from about 1.5 to 2 when I jumper the channels.

Thanks for the 34 vs 84, that was an assumption that the octals would all work fine.
Logged
wyatt
Guest
« Reply #3 on: December 09, 2008, 04:19:19 PM »

Excellent answer, thanks. I am trying to get just a bit more clean volume out of it- it seems to be almost full out from about 1.5 to 2 when I jumper the channels.

Thanks for the 34 vs 84, that was an assumption that the octals would all work fine.

The transformer doesn't care if someone uses octals or novals, 6V6GT's and EL84s are very similar tubes as far as the OT are concerned, same output, same impedance, etc. 

For a PT; a pair of 6V6GT's draw about 1A, a pair of EL84's draws about 1.5A' a pair of 6L6GC's draws about 2A, and a pair of EL34's draws about 3A. 

If you really only want a bit more clean volume, you may get it, but the reality is, most people need enough extra clean volume to get a noticeable difference, and that you may not get.  Just remember, it's only a 12-watt amp and just about everything about its design works against clean headroom, from it's tone stack to its PI, to its voltages, nothing in the amp is headroom friendly.

It may still be full out at 2, you are changing the output section, not the preamp or PI.  Do you have a 12AY7 at V1?  That is the stock 5E3 spec.  People have experimented with various tubes in V1 and V2 to try and control the volume taper.  Preamp tubes won't have much of an affect on overall output volume, but they can offer a little more control over the taper of the Volume pot.
« Last Edit: December 09, 2008, 04:25:53 PM by wyatt » Logged
LUSN
Newbie
*
Offline Offline

Posts: 10


View Profile
« Reply #4 on: December 11, 2008, 02:06:23 AM »

Thanks again! Yes, I do have a 12AY7 in V1. When it came to me, the guy did have a 12AX7 there, and it was way too hot.

I tried an AU7, too weak sounding. I guess I am just trying to turn this into a grab and go that I can use at jams- it is so lightweight, much easier to transport than my Vic Bassman.

Thanks
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.