Mini JCM Project

kukulcanenator · **Joined:** Fri May 22, 2009 5:11 am **Posts:** 36

you ever built anything from ax84, theres some interesting stuff down there recently...

RMS · **Posted:** Tue Jun 23, 2009 1:03 pm

No, I never have though its a cool site with some neat projects.

vht60h · **Posted:** Mon Jun 29, 2009 6:46 am

Hey kukulcanenator!

Very interesting schematic, I'm focusing on the Baxandall Tone Stack, it seems to be a good variation of the lite one I knew.
Gonna check that!

Thanks!

http://www.carvinmuseum.com/pdf/amps/VL100%20&%20VL212%20Legacy%20Amp.pdf

kukulcanenator · **Joined:** Fri May 22, 2009 5:11 am **Posts:** 36

watch out on the carvin schematics at there looks to be some missing section on the power supply coupling, as the schematic stands it will probably scream like hell!!

The general preamp and tonestack looks ok but take the powersupply to those preamps with a pinch of salt.

I noticed the different tonestack too, looks to be a lot of tone shaping in the preamp...

RMS · **Posted:** Mon Jun 29, 2009 6:24 pm

Usually when you see extra caps in the pre-amp like on the plates its there to keep a high gain amp stable. You will see this on other high gain amps too.

Amptone1 · **Joined:** Tue Jul 07, 2009 9:17 pm **Posts:** 2

I am thinking of converting a 2xEL84 amp I have into a miniJCM. The transformers are Hammond 270DX and 1608. They are very similar to those posted on this site, but are slightly different. One difference is that I do not have a center tap, while the Transformer that was listed does.

Will that be a problem? Will these transformers be acceptable substitutes? I can post the specs if anyone would want to see them (don't have them with me at the moment).

Thanks,

Rich

RMS · **Posted:** Wed Jul 22, 2009 7:17 pm

Amptone1 wrote:

I am thinking of converting a 2xEL84 amp I have into a miniJCM. The transformers are Hammond 270DX and 1608. They are very similar to those posted on this site, but are slightly different. One difference is that I do not have a center tap, while the Transformer that was listed does.

Some times these have more than one CT, on the heaters then one on the HV. Notice that in my layout for the mini I forgot to show the HV CT.... egads

On the heaters we do not use the CT instead we make an artificial one with 2-100 ohm resistors. Some Fenders use 2-47 ohm.

I think you can get away with it, BUT you should plug in some data here, then compare the specs.

http://www.dreamtone.org/Calculate_Current_Form.htm

Sorry for the delay on your post here, I thought I would be notified but I found it by accident.

Rob

sungangsg · **Joined:** Sun Aug 02, 2009 10:20 pm **Posts:** 1

so nice!!! 做的太好了，在这里很多知识，希望能多多交流 xbeer

RMS · **Posted:** Tue Aug 04, 2009 7:21 pm

sungangsg wrote:

so nice!!! 做的太好了，在这里很多知识，希望能多多交流 xbeer

Thanks and welcome to the forum!

感谢和欢迎到论坛!

grieve · **Posted:** Sat Jan 16, 2010 1:29 am

I'm so glad I found this site, its exactly what I've been looking for. Thanks guys.

RMS · **Posted:** Sat Jan 16, 2010 9:08 pm

grieve wrote:

I'm so glad I found this site, its exactly what I've been looking for. Thanks guys.

Welcome to the Forum!

Have you built any amps before?

ahvia_musicom · **Posted:** Mon Jan 18, 2010 10:28 am

im new to this site im so glad to have found this forum

hoping to build this myself it would be my first project though

RMS · **Posted:** Mon Jan 18, 2010 11:24 am

Welcome to the forum!

grieve · **Posted:** Wed Jan 20, 2010 5:50 pm

RMS wrote:

Welcome to the Forum!

Have you built any amps before?
Posted: Sun Jan 17, 2010 11:08 am

Thanks! I've built a couple:

This one 2 x EL84, 2 x 12AX7 -
http://ozvalveamps.elands.com/ava100/av ... ington.htm - interesting design using voltage multiplier to generate HT from 2 x low cost 30Volt transformers. Sounds great too.

and the 5 Watt Champ clone kit from evatco.com.au

dodona · **Posted:** Thu Mar 11, 2010 3:19 am

interesting. I miss the password.

Mini JCM Project

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