My X10 has begun

Ian444 · Post by **Ian444** » Wed May 11, 2011 6:09 am

Maybe he tossed that crappy radioshack iron in the bin

Waiting for a new one...

surfsup · Post by **surfsup** » Wed May 11, 2011 11:22 am

I'm very close! ... but I hit a snag. I snipped the lead to one of the 2k2 to the EL84, used my roundnose pliers to loop it for crimping to the wire and while looping the lead it snapped! Must have been a nick or something in the lead. The length leftover is really short I don't think I can make it work.

Worst thing is I don't have another 2k2. So now I gotta get another one and pay $15 shipping. Not happy...

pamaz67 · Post by **pamaz67** » Wed May 11, 2011 12:26 pm

if you have something around there , 1k5, 3k3, 4k7, 5k6 you can use it to make the fisrt test and then replace it.

surfsup · Post by **surfsup** » Wed May 11, 2011 12:51 pm

I have a box of stuff for a dumble build with a bunch of Rs. I'll see if I have another larger W resistor to use tonight when I get back from work that's somewhat close in value.

Lonely Raven · Post by **Lonely Raven** » Wed May 11, 2011 1:20 pm

That looks well laid out! Your planning paid off!

I have a bunch of vintage Carbon Comp resistors at home, I probably have what you need, or really close. PM me what town your in, maybe I can swing by and drop some Resistors off for you to play with.

pamaz67 · Post by **pamaz67** » Wed May 11, 2011 2:25 pm

nice build, that I'm sure will sound great.
just an idea for all the switched pots you've got:
You can use one for the sparkle /bright switch, another for including or excluding the famous 56/82K (or whatever value could be) grid leak so to tame the overall gain, and the last could be used to change the slope resistor in the tone stack, or to select two different cut frequencies at the rc filter

M Fowler · Post by **M Fowler** » Wed May 11, 2011 3:26 pm

The Solen Fast caps are large but I bet the payoff in tone is worth the headache of designing around them. Looks good.

Mark

telentubes · Post by **telentubes** » Wed May 11, 2011 5:27 pm

Surfsup... I've been following these X10 threads closely since listening to the initial Greg V demo, and am grateful to you and the others who have been decoding this very cool amp. I'm looking forward to building one down the road. Your project looks fantastic. All the careful planning is paying off and you should end up with a great amp.

surfsup · Post by **surfsup** » Thu May 12, 2011 7:14 pm

Something is wrong here please help.

I tested all my grounds and lead connections using continuity and testing for resistance making sure it reads 0.001 or less on my DMM. Everything is fine.

I plugged a 1/4" pedal jumper into the input and each speaker jack, tested for grounds and continuity. Everything is fine.

I plugged a power cable in, clipped the dmm to the third prong and again tested all the grounds. Everything is fine.

I plug it in, throw the power switch. I read 333VAC at the first resistor, 330 after, and a whopping 462VDC after the diodes! 333*1.4=462 so seems right. It is that I have no tubes installed? I should be getting 300 at the resistor and 335V after the 1k 5W resistor. Please let me know if this will be fine with the tubes in, drawing current?

Also, I assume at these voltages I shouldn't flip the standby switch (w/o tubes)?

M Fowler · Post by **M Fowler** » Thu May 12, 2011 7:46 pm

You don't have a load to draw the voltage down.

surfsup · Post by **surfsup** » Thu May 12, 2011 8:07 pm

okay thanks. I uploaded a bunch of AP to the original post on page one FYI if you wanna check it out.

surfsup · Post by **surfsup** » Thu May 12, 2011 8:20 pm

Well I put the tubes in, the two blue ohmite 1k 5w resistors started to smoke so I shut it down and moved it outside. I didn't have time to check any voltages or anything. They were fine with just the main on/off switch on. Only after I hit the standby. Any ideas?

The datasheet for these resistors shows max voltage 460 and now they need replacement:

http://www.ohmite.com/catalog/pdf/40_series.pdf

[img

2000]http://chicagocadcam.com/ChrisHahn/xen1 ... 0small.jpg[/img]

Lonely Raven · Post by **Lonely Raven** » Thu May 12, 2011 8:27 pm

Got any good photos of the power section? How is your fusing and switching done?

Is the VVR shorting maybe?

surfsup · Post by **surfsup** » Thu May 12, 2011 8:41 pm

Is the PT CT supposed to be grounded or taped off? I posted some photos on the first post...here are a couple b4 they turned brown and crispy:

EDIT: I forgot to mention the LED doesn't come on either.

100% crop:
[img

1588]http://chicagocadcam.com/ChrisHahn/xen10/RAIL-100.jpg[/img]
[img

2000]http://chicagocadcam.com/ChrisHahn/xen1 ... 1small.jpg[/img]

Lonely Raven · Post by **Lonely Raven** » Thu May 12, 2011 9:36 pm

Is the NTE insulated from the chassis?

Edit to add: For safety, hot should go to the back terminal of the fuse block, so when you're pulling the fuse, it breaks contact from the hot *first*.

Beyond that, I don't know, I'm only an egg.

The Amp Garage

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