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Old 08-24-2010, 07:53 AM   #1
JAM SAXON
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Epiphone Valve Junior =)

just got one! and it is a beutiful amp. just posting to say that basically any bad things you hear are lies.
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Old 08-24-2010, 07:58 AM   #2
Kanthras
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Originally Posted by JAM SAXON
just posting to say that basically any bad things you hear are lies.
Okay. How's the crunch? And the distortion?

I have one too and you have to recognize its faults. Then start modding the **** out of it.
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Old 08-24-2010, 08:04 AM   #3
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Originally Posted by Kanthras
I have one too and you have to recognize its faults. Then start modding the **** out of it.

Did you upgrade the power transformer when you added a valve? Particularly the heater cct.
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Old 08-24-2010, 08:06 AM   #4
Kanthras
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Did you upgrade the power transformer when you added a valve? Particularly the heater cct.
Nah, but the heater voltage is still above 6 volts. The transformer is pretty oversized I think.

It doesn't work anymore, though. The problem is that the circuit board I used for the extra preamp circuitry has become conductive. For some reason, it has lots of metallic dust ingrained in it.
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Old 08-24-2010, 08:12 AM   #5
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There's no rectification on the heater so it's voltage wouldn't really drop off until it actually died. How hot it gets physically is a better guide.
Go the whole hog. Make a turret board and replace the whole guts, rip out their cct board as well. If you like to mod, a turret boards is invaluable. You can point to point most of it anyway. The cct for that is almost identical to a Champ and I p2p'd everything except the filter caps.
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Old 08-24-2010, 08:14 AM   #6
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Quote:
Originally Posted by JAM SAXON
any bad things you hear are lies.

There's plenty of bad things that are true about the Valve Junior. Don't make dumb blanket statements, and especially don't make a thread just to post them. I have a VJ and love it, but it has plenty of shortcomings.
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Old 08-24-2010, 08:17 AM   #7
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Originally Posted by Cathbard
There's no rectification on the heater so it's voltage wouldn't really drop off until it actually died. How hot it gets physically is a better guide.
I have checked that, it doesn't even get warm. I'd say volume wise, it's no less than half the size of the transformer in my Bugera. So it should be fine.

Quote:
Go the whole hog. Make a turret board and replace the whole guts, rip out their cct board as well. If you like to mod, a turret boards is invaluable. You can point to point most of it anyway. The cct for that is almost identical to a Champ and I p2p'd everything except the filter caps.
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That's a really good idea, though. I'd love to do that someday. I've done a lot of work on the PCB as well, and it's starting to lift traces. Sucks having to take everything out to do some soldering as well. I'll need to find a place for turret boards in Holland, though. That might not be easy.

Either way, it IS going to get VERY tight with a turret board...

edit: Just found an online shop for turret boards. That was easier than I thought...

edit2: And it's gonna be a bitch to re-use components, as they're all clipped short. Damn.
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Old 08-24-2010, 08:28 AM   #8
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Sounds like the tranny had room to spare ampwise. That's handy. If you do notice it starts to get too hot you can just add another transformer just for that valve. At 6V parallel connection a 12AX7 only pulls 300mA for the heaters so it wouldn't be a very big tranny.

Making your own turret boards is really easy. The tool to do it only costs a few bucks. I got mine along with all the turrets and fibreglass board off ebay. If you do it yourself you can tailor it to fit. If you do a lot of it p2p you will only need a tiny board.
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Old 08-24-2010, 11:22 AM   #9
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Quote:
Originally Posted by Cathbard
There's no rectification on the heater
I think that's only the early models.

The Vjr is a fine amp for a 5 watter if you add pedals. The amp doesn't have much character on it's own and is a bit dark. But with pedals you can make it sing.
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Old 08-24-2010, 11:52 AM   #10
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Originally Posted by Kanthras
I have checked that, it doesn't even get warm. I'd say volume wise, it's no less than half the size of the transformer in my Bugera. So it should be fine.



That's a really good idea, though. I'd love to do that someday. I've done a lot of work on the PCB as well, and it's starting to lift traces. Sucks having to take everything out to do some soldering as well. I'll need to find a place for turret boards in Holland, though. That might not be easy.

Either way, it IS going to get VERY tight with a turret board...

edit: Just found an online shop for turret boards. That was easier than I thought...

edit2: And it's gonna be a bitch to re-use components, as they're all clipped short. Damn.


Try musikding.de

They have everything. In the world. IN THE WORLD.

Anyway, im betting you could replace all the components and get a turret for it for less than 30
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Old 08-24-2010, 11:53 AM   #11
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Quote:
Originally Posted by tubetime86
There's plenty of bad things that are true about the Valve Junior. Don't make dumb blanket statements, and especially don't make a thread just to post them. I have a VJ and love it, but it has plenty of shortcomings.


+1

certainly the older v2 that i have.
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Old 08-24-2010, 12:15 PM   #12
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Originally Posted by fly135
I think that's only the early models.

The Vjr is a fine amp for a 5 watter if you add pedals. The amp doesn't have much character on it's own and is a bit dark. But with pedals you can make it sing.

They have an AC heater circuit, converting it to DC is a popular mod. Kanthras was measuring and connecting his, care to confirm/refute my statement, Kanthras? Is the heater circuit directly off the transformer or does it go through a rectifier?
Hardly anything but boutique amps use DC heater circuits and then they crow about it.
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Old 08-24-2010, 01:06 PM   #13
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IIRC the V2 design has DC heaters. This was bandied about as common knowledge when it came out.
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Old 08-24-2010, 01:08 PM   #14
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yeah i think so
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Old 08-24-2010, 01:16 PM   #15
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The one I modded for Dan was a V3 and had DC heaters. My friend's V1 did not.
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Old 08-24-2010, 01:35 PM   #16
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Originally Posted by JAM SAXON
just got one! and it is a beutiful amp. just posting to say that basically any bad things you hear are lies.

Awesome, dude. Congrats! Glad to hear you are happy and enthusiastic about your purchase. It's refreshing!
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Old 08-24-2010, 01:51 PM   #17
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Originally Posted by Roc8995
The one I modded for Dan was a V3 and had DC heaters. My friend's V1 did not.

Damn you've known that the whole time? I've been trying to figure out what version that is for months.
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Old 08-24-2010, 02:13 PM   #18
Kanthras
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Originally Posted by Cathbard
They have an AC heater circuit, converting it to DC is a popular mod. Kanthras was measuring and connecting his, care to confirm/refute my statement, Kanthras? Is the heater circuit directly off the transformer or does it go through a rectifier?
Hardly anything but boutique amps use DC heater circuits and then they crow about it.
Yeah, they had AC in the first version. Mine has DC (V3).

I replaced the shitty conductive perfboard I used with another shitty perfboard that at least doesn't conduct. Works great now. The sound it makes can be best described as "fuzz from hell".

I still need to make some adjustments, though. If I hit the low string hard (drop A), it goes into blocking distortion or something. Can't be a good sign.

Quote:
Originally Posted by beckyjc
Try musikding.de

They have everything. In the world. IN THE WORLD.

Anyway, im betting you could replace all the components and get a turret for it for less than 30
Looks like a nice place to satisfy my electronic needs, thanks! Too bad they don't have turretboards.
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Old 08-24-2010, 03:16 PM   #19
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Well there ya go. Good to learn something new. It is a good idea.
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Old 08-24-2010, 03:23 PM   #20
Kanthras
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Well there ya go. Good to learn something new. It is a good idea.
Hehe, gonna see if I can get some turret board, anyway. Swapping out components is a massive PITA now and it definitely needs some tweaking.

That site becky suggested is really nice. TS-808 kits for 22,50 Euro? GAS comin' right up...

These look pretty nice for a turret board replacement: http://www.musikding.de/product_inf...Strip-1x30.html

Two rows of those things, nice and compact. Might go for that instead.
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