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First time build (Read 8655 times)
jpv
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First time build
11/13/12 at 03:13:56
 
When I was at Decfest 2012 I bought a board (ver 10 2012) to build this amp.
I always wanted to build a kit and this looks like a great place to start.
This is all new to me so I hope to learn a lot with some help from you guys.
I will be ordering the parts soon. Other then what is listed on the parts list are there any other items I need to get?
I will also be ordering a soldering iron from parts express. I have a VOM, solder. Do I need a de solderer sucker or the de soldering braid?
 The instuctions are not very clear as to how to go about building this so if you can list some pointers on how to proceed that would be great.

I have seen some really nice builds shown here and I hope mine comes out just as nice.

Thanks
John
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VPI Scoutmaster, Grado Sonata1, Counterpoint pre amp and amp (modded by Altavista Audio), Proac sp. and home made subs. Lots of room treatment. Anti-cable sp cables, Decware IC, ZKit 1.
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marky
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Re: First time build
Reply #1 - 11/13/12 at 10:58:33
 
Hi John,
A small piece of damp sponge to wipe the s.gun tip between solders
keeps it optimum. You can get these `all in one` in a station and
means you dont have to perch the gun somewhere when not using.
Solder guns are usually for removing old solder efficiently, again handy
just in case. Obviously a pair of long nose pliers and snips. Good luck
and have fun in overcoming those ` I wish I had another hand ` moments.

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mboxler
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Posts: 85
Re: First time build
Reply #2 - 11/13/12 at 14:47:38
 
Hey John...

Sounds like you got the new board with the corrected wiring (for the Edcor's), as well as the 100 Ohm virtual CT for the heaters???  These will help a lot.  I'm still working on mine.  I tested the 100 Ohm CT revision, and it did remove most of the AC hum from the heaters.

Be sure you have an alligator clip on you VOM.  Attach it to the grounded side of any component, and use the red lead to test voltages.  Very high voltages...you don't want both hands near the board when powered on!

Take your time!  You will learn a lot!  I know I have.

Mike



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« Last Edit: 11/14/12 at 00:20:36 by mboxler »  
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jpv
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Posts: 110
Re: First time build
Reply #3 - 11/14/12 at 02:50:26
 
Thanks for the tips and suggestions. I will add a IEC power connector and fuse holder to the list along with snips. I have a base with clips on it to hold the board as I work.

Are the any things you wish you did or would do over.
Is there any order to how this is to be built.
Can you show a pic of your completed board.
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VPI Scoutmaster, Grado Sonata1, Counterpoint pre amp and amp (modded by Altavista Audio), Proac sp. and home made subs. Lots of room treatment. Anti-cable sp cables, Decware IC, ZKit 1.
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mboxler
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Posts: 85
Re: First time build
Reply #4 - 11/14/12 at 19:50:39
 
If it's not too late, I got the IEC with the fuse holder built in.  Less wiring!  I spent hours trying to figure out why my voltage (D) was so high.  I finally swapped the 6922 tube with a 6N1P, and the voltage dropped to within specs.  Thought I had a bad solder joint or component.  What a relief.  Be sure to mount the big ol' 1K 5W resistor an inch from the board (and everything else).  It gets hot!!!

I plan on installing a standby switch

http://tubedepot.com/p-dpst-3way.html

to let the tubes warm up before feeding the amp the full voltage.  Not required, but worth a Google.

Have you ever soldered before?  If not, and you would like to practice on something, you could buy a prototype board like this

http://www.ebay.com/itm/Vacuum-Tube-prototype-project-board-8-pin-tubes-/1407228...

Solder pieces of wire, unused resistors, etc, 'til you feel a little more comfortable.

I'll to get some pictures, if I can find my wife's camera.

Mike

Oh...I wish I hadn't sold my '71 Chevelle SS 454 when I was younger, but...

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« Last Edit: 11/14/12 at 20:58:43 by mboxler »  
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jpv
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Posts: 110
Re: First time build
Reply #5 - 11/15/12 at 14:28:42
 
Mike,
 I like the idea of the stand by switch and the built in fuse holder.
I have boxes and bags full of resistor, and other part left in the attic by the guy who sold me my house. Plenty of stuff to practice on.
I should go thru it all too see what I have. He had them in vaccum tube boxes so when I first saw it I thought I hit the jackpot.

Anyway I will order the parts this weekend.

I looked at the board last night and I have some question but I will ask them as time goes on.

John
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VPI Scoutmaster, Grado Sonata1, Counterpoint pre amp and amp (modded by Altavista Audio), Proac sp. and home made subs. Lots of room treatment. Anti-cable sp cables, Decware IC, ZKit 1.
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mboxler
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Posts: 85
Re: First time build
Reply #6 - 11/19/12 at 16:46:05
 
John

Here is a picture of my builds.  I soldered the 150 ohm 5W resistor and one of the 10K ohm 5W resistors to the tube side of the board, as it got crowded on the component side.  I plan on replacing the big black 1K 6W resistor, as I failed to allow for the 1 inch clearance.  This is the Rev 9 2011 board...yours should have the correct wiring colors and the 100 ohm virtual tap for the brown heater wires.

Mike
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jpv
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Re: First time build
Reply #7 - 11/19/12 at 20:15:31
 
Mike,
 I like that case you are using. Where did you get that?
Are you making two of them?
I see you are mounting the RCA and Speaker terninals on the case.
I was thinking of doing the same thing.
The parts were ordered today so now I have to wait for them to arrive.

Thanks for posting the photo I will use it as my guide.

John

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VPI Scoutmaster, Grado Sonata1, Counterpoint pre amp and amp (modded by Altavista Audio), Proac sp. and home made subs. Lots of room treatment. Anti-cable sp cables, Decware IC, ZKit 1.
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mboxler
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Posts: 85
Re: First time build
Reply #8 - 11/19/12 at 22:26:54
 
Yep, two amps.  I was going to wire them both mono, but now I'm not sure.  I got them from Keith (Ebay member po1019).  They were already made, and I took a chance that I could fit everything.  It's tight, but I think they will work.  He does great work, and will build any size you need.  Here is a link to his products.

http://www.ebay.com/sch/po1019/m.html?hash=item3a75963758&item=251080882008&pt=V...

Mike
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jpv
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Cause inside
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Posts: 110
Re: First time build
Reply #9 - 11/20/12 at 01:06:55
 
Thanks for the link. What size did you get?
Do you think the 8 x 7.4 x 2.2 would be big enough?
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VPI Scoutmaster, Grado Sonata1, Counterpoint pre amp and amp (modded by Altavista Audio), Proac sp. and home made subs. Lots of room treatment. Anti-cable sp cables, Decware IC, ZKit 1.
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mboxler
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Posts: 85
Re: First time build
Reply #10 - 11/20/12 at 14:36:51
 
Hey John...

The inside dimensions of the matching pair I bought were ~ 8.25 W, 8 D, and 2.25 H.  The board (I think) is 6 x 6.  Very tight (hope I can pull it off).  The one you are looking at is 6.3125" x 7.25" x 2.0625" internally.  I think that is way too small.

Are you going to mount a separate pot to the chassis?  I cheated.  I used the PCB pot, and drilled a hole in the front of the case where it would poke through after mounting the board to the top of the case...about 1/4" from the front.  This was easier for me (I'm still new at this as well), and gave me 2 inches on one side and the back.

The transformers on top are a little tight as well (I'll try to get more pictures tonite).  I know a lot a others have mounted the OT's in the case.  Again...I hope my idea works!

Anyway, if I were to do this again for a single stereo amp, I'd add 1 to 2 inches in width, and 1 inch in depth.  The 2.25 H is okay...2.5 would be a little better.  Again, an external pot might change things a little???  I'd order a custom one from Keith.  He needs the INTERNAL dimensions, and you could select the wood that you like.  Again, he is wonderful to work with, and they usually take about a week to build.

Give it some thought while you are building the board.  Did you order Edcor transformers?  Mine took a full six weeks to arrive, so you have plenty of time to think about it.

I'm new to this too, but will be happy to help as much as I can.

Mike



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jpv
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Re: First time build
Reply #11 - 11/21/12 at 05:11:20
 
Mike,
I ordered the transformers yesterday. I know 6 weeks is a long time.
Two of the parts from Mouser are not in stock so I will have to wait on that also.
 The case I will wait on untill I layout the parts. A 1-2 week leadtime is not bad. I made a case for my subwoofer plate amp and I might follow that design concept.
Keep us posted on your progress
John
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VPI Scoutmaster, Grado Sonata1, Counterpoint pre amp and amp (modded by Altavista Audio), Proac sp. and home made subs. Lots of room treatment. Anti-cable sp cables, Decware IC, ZKit 1.
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mboxler
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Posts: 85
Re: First time build
Reply #12 - 11/21/12 at 14:43:57
 
Sounds good.  I noticed that the new 100 ohm resistors for the virtual CT for the heater wires were not in the parts list (at least I didn't see them).  If you need a couple, I bought 10 (since they were cheap, but shipping isn't).  I'd be happy to mail you a couple if that helps.

Mike
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jpv
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Cause inside
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Re: First time build
Reply #13 - 11/23/12 at 21:16:38
 
Your right they are not on the list or is it shown on the schematic.
I also noticed a part# that is not correct for on set of resistors.
You can send me the resitor if its not that much of a problem.
I can send you a PM with my address.
I am going to add two sets of inputs to my amp for some added flexability. I did order the RCA phono connected listed just incase I change my mind.
Did you add the 3-way power switch to keep the heaters on?
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VPI Scoutmaster, Grado Sonata1, Counterpoint pre amp and amp (modded by Altavista Audio), Proac sp. and home made subs. Lots of room treatment. Anti-cable sp cables, Decware IC, ZKit 1.
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mboxler
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Posts: 85
Re: First time build
Reply #14 - 11/24/12 at 01:17:49
 
Good thing I bought extras!  PM me, I'd be happy to send you a couple.  Received the switches yesterday.  DMM shows they should work...will rig up a test to be sure before I stuff everything onto the case.

BTW...here's the top view of the chassis.  Drilled a few more holes today, but taking it slow.  Notice the hole under the PS transformer?  That's what happens when I get tired.  Good thing the transformer covers it up when I remove the spacers.

Mike
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« Last Edit: 11/24/12 at 01:20:32 by mboxler »  

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