Express into 60w
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Express into 60w
first of all, sorry for dumb questions...
recently i got a Ceriatone Express with Pacific OT.
and i'd like to change the output into 60w -> full output of 2 * EL34 for the big transformer sound.
1. do i need to change only the power transformer?
or both PT and OT?
2. i will order the tranny from Heyboer and will have a local tech do the mod.
what does the local tech need to change, except connecting / re-wiring the new transformer?
for ex, does he need to change the power-section components with new values?
3. are there some reference schematics for 60w Express?
4. to reduce the risk of this 60w experiment, can i use Concorde tranny?
i found Concorde's voltage (~500v) is very different to Express (~400v).
5. why does Concorde use ~500v ?
i feel Express (~400v) is already stiffer side in tone. (than marshall)
recently i got a Ceriatone Express with Pacific OT.
and i'd like to change the output into 60w -> full output of 2 * EL34 for the big transformer sound.
1. do i need to change only the power transformer?
or both PT and OT?
2. i will order the tranny from Heyboer and will have a local tech do the mod.
what does the local tech need to change, except connecting / re-wiring the new transformer?
for ex, does he need to change the power-section components with new values?
3. are there some reference schematics for 60w Express?
4. to reduce the risk of this 60w experiment, can i use Concorde tranny?
i found Concorde's voltage (~500v) is very different to Express (~400v).
5. why does Concorde use ~500v ?
i feel Express (~400v) is already stiffer side in tone. (than marshall)
Re: Express into 60w
Why go to the effort of changing the OT? Just remove two power tubes, and halve the speaker load.
EDIT: Duh. I was sleepy. Don't sleep and post. Sry. *mumble mumble*
EDIT: Duh. I was sleepy. Don't sleep and post. Sry. *mumble mumble*
Last edited by xtian on Sun Aug 06, 2017 5:51 pm, edited 1 time in total.
I build and repair tube amps. http://amps.monkeymatic.com
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Re: Express into 60w
Don't let the 35 watt Express fool you. The amp still sounds huge at 35w and is part of how the amp works/ responds.
The amount of money to buy bigger transformers and have a tech install it would not be worth it for a experiment.
The amount of money to buy bigger transformers and have a tech install it would not be worth it for a experiment.
Re: Express into 60w
I'm not sure you can even get 50w out of two el34s. The el34 has a maximum plate dissipation of 25w. To get 60 you may have to switch to something like 6L6GCs.
To get a full 60watts out of two 6L6s you may need to raise the plate voltage higher than the standard express value of 400. So, new PT. If your output transformer is say rated for 40w, then you will need to replace that too.1. do i need to change only the power transformer?
or both PT and OT?
With higher voltages, the main power supply caps and bias circuit may need to be changed/upgraded. It depends on what is in there.2. i will order the tranny from Heyboer and will have a local tech do the mod.
what does the local tech need to change, except connecting / re-wiring the new transformer?
for ex, does he need to change the power-section components with new values?
Since you could potentially be into most of the cost of a whole new amp with the above "mod" why not just build a whole new marshall style amp and leave the express alone?i feel Express (~400v) is already stiffer side in tone. (than marshall)
Mike
Re: Express into 60w
I know a couple of the guys (Allyn & M Fowler) built 80w versions of the Express
Not something you hear everyday "my Express isn't loud enough"
Unless you're playing Che Stadium without a P.A. I'd be more concerned with an airbrake.
A buddy set up for ban practice & unfortunately pointed 2 4x12 cabs at the drummer - Express with all controls at 5.
I got a funny phone call - "his eyes are open but he's not making much sense yet"
Not something you hear everyday "my Express isn't loud enough"
Unless you're playing Che Stadium without a P.A. I'd be more concerned with an airbrake.
A buddy set up for ban practice & unfortunately pointed 2 4x12 cabs at the drummer - Express with all controls at 5.
I got a funny phone call - "his eyes are open but he's not making much sense yet"
Why Aye Man
Re: Express into 60w
I would build a Komet 60 rather then the Express much smoother sounding.
Either way, your going to need the appropriate PT and OT.
Mark
Either way, your going to need the appropriate PT and OT.
Mark
Re: Express into 60w
thanks for the input, guys~!!
as you advised, it seems better to build another DIY amp.
i searched forums but i couldn't find Concorde schematics and layout. (maybe it is commercial?? )
i will be very very glad if you share Concorde build info such as schematics, layout, part list and so on.
Last edited by idnotbe on Tue Aug 08, 2017 6:59 pm, edited 1 time in total.
Re: Express into 60w
http://el34world.com/Forum/index.php?topic=22182.0
Way down towards the bottom of the post Barry shows his layout for the Asteroid same amp.
Mark
Way down towards the bottom of the post Barry shows his layout for the Asteroid same amp.
Mark
Re: Express into 60w
Mark, always thanks for the kind answers.M Fowler wrote: ↑Mon Aug 07, 2017 7:59 pm http://el34world.com/Forum/index.php?topic=22182.0
Way down towards the bottom of the post Barry shows his layout for the Asteroid same amp.
Mark
and if somebody have Concorde (not K60) schematic / layout / part list, plz pm or e-mail me.
Re: Express into 60w
I seem to remember the Concorde had a cathode follower stage after the third stage. I thought there was a circuit of it floating around. As far as I can remember it was similar to the K60, I recall builders thought it was a very rocky sounding amp.
Yours Sincerely
Mark Abbott
Mark Abbott