New Build: Ceriatone Replica OTS 50W

[dwietzel]

Charlie,

Found this 124 schematic. Any thoughts?

[ToneMerc]

Do you know of a drop replacement other then the $300 MM? Would appreciate any guidance.

If I do go with the Hammond, do I need a separate PT for the relays as someone suggested?



Dave

You could use a JTM45 PT as it has the same mounting centers as a Fender Twin. Then power the relays from the 5V rectifier tap and then change the 7812 to an 7809 and use 5V relays.

http://www.classictone.net/40-18033.pdf

Off the top of my head I'm thinking the only caveat verses the heavier HT rating of a BF Bassman PT would be a bit more sag when the amp is driven hard.

TM

[Charlie Wilson]

Dave, there you go, TM solved your transformer issue. That schematic will work. It is for a low plate Skyliner. Yours is going to be a high plate, so instead of 100k plate load/1.5k cathode, you will have 220k/3.3k and 150k/2.2k. Your od trimmer will be 100k instead of 346k and od drive will be 100k instead of 250k. Also it wouldn't take much to tweek your circuit to a Robben Ford 102.
CW

[dwietzel]

Thanks to TM and Charlie.

Charlie, Robben Ford is what I am after. Any help getting me there would be VERY much appreciated.

[M Fowler]

Mike has been selling boards, loaded or unloaded and chassis for years and faceplates.

Mike has also been building/selling complete Overlord OTS amps for years so he should certainly know what transformers to use in his chassis.

Most either go custom PT to get the proper relay power taps in that 50w PT.

[Charlie Wilson]

Dave, Robben Ford's amp is a high plate Skyliner. I would build your amp per your layout first, it should have a Robben Fordish sound to it. Then if you want to tweek it to 102, compare your layout to the 102 layout in the file section. You only have to change a couple components. One note, if you go with TM's suggestion, you may have to use 5v relays.
CW

[dreric]

Here ya go:

http://www.ebay.com/itm/Radioshack-12-V ... Sw4GVYLe2Q

http://www.classictone.net/Fender-Blond ... rmers.html

Ceritone trannies are weak

[dwietzel]

Kit is out of the box and on the bench!

[MakerDP]

Actually Radio Shack still sells electronics bits and pieces just like always. Problem now is finding a Radio Shack store...

[Aaron]

Kit is out of the box and on the bench!

Interesting faceplate.....

[M Fowler]

Mike started selling the Ceriatone chassis with Dumble plates last year.

[M Fowler]

For those wanting to build a low powered version 30w or so the Ceriatone Dizzy 30 PT fits perfect in this chassis.

285-0-285V 200mA
3.15-0-3.15V 5A
5-0V 4A

[dwietzel]

Did a test fitting. Everything seems to have a home

[Charlie Wilson]

Dave, did he send you some coaxial?
CW

[dwietzel]

Charlie,

Short answer, no.

Long answer

Mike at Marsh sent whatever I asked for. There was no BOM and all I have had to work off from the beginning is the layout at the beginning of this thread.

So, I am doing the best I can to build the BOM myself and I am sure I have missed things I need. Here are some things I am unsure of if you can help.

1. It looks like all the mini switches are DPDT even though they don't necessarily need DPDT (for ex, I think the Mid could have used SPST).
2. Getting the right component for the 5 pin jack foot switch
3. Sourcing the relays and Regulators especially if I change to 5V as suggested with the JTM45 PT
4. Sourcing components or finding a off the shelf generic foot switch.
5. Sourcing proper component for the Half Power switch.

Dave