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GB Pass M2 Clone Boards with 120mm UMS spacing by Tea-Bag

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wdecho

Member
Joined 2014
Tea-Bag said:
Important detail.

Tommorow I will order the boards and the transformers. The turn around time on boards is 2-3 weeks till I see them, then I take up to a few days to ship them out ( assuming a weekend).

The factor that is unknown to me, and doesn't affect you , is how long the edcor transformers will take to show up. They say up to six weeks, so I hope it takes less, but assuming it takes six weeks since I will be ordering close to 100 units.
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I have been building a few tube amps lately buying the trans from Edcor. The time has been 2 to 4 weeks before shipping but of course it could take longer as they say. I have heard of even 8 weeks but 3 weeks has been the norm for me.
 
R

Russellc

Member
Joined 2003
Paid Member
wdecho said:
I have been building a few tube amps lately buying the trans from Edcor. The time has been 2 to 4 weeks before shipping but of course it could take longer as they say. I have heard of even 8 weeks but 3 weeks has been the norm for me.
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For a while there, I think they were ahead on the transformer for the M-2. I got mine real fast, about a week if I remember correctly. Dont know if they are still in stock like they were but I got the feeling they were getting lots of inquiries on it and got ahead of the curve. Tea, You may want to give them a call and let them know what's getting ready to go down!

I've got everything coming from this group buy as well, next M-2 I think I might try the Toshiba mosfets, I have a couple sets around here somewhere from F-5 days.

Russellc
 
R

Russellc

Member
Joined 2003
Paid Member
syklab said:
Hi Russellc,
Any noise or low level hum from your build? How do you wire your ground?

Thssaanks
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Not any noise at all, even with horns. CL-60 to ground on chassis, ground on IEC plug/fuse/switch to same spot. Rca and speaker posts float of course. Most of these firstwatt amps are very similar. Member 6L6 has build guides for F-5, F-6 AlephJ and BA-3 amp. Do it just like he does. Every piece of Pass stuff I have including the preamps and Pearl 2 Phono pre are DEAD quiet. Nothing. NADA.

Russellc
 
Tea-Bag

Tea-Bag

Member
Joined 2006
Paid Member
syklab said:
Hi Russellc,
Any noise or low level hum from your build? How do you wire your ground?

Thanks
Click to expand...

When I did not use shielded input wire I had hum, if the signal wire actually got to close to the edcor transformer (not so much the AC power transformer).

You will note that Nelson used a top shield on his. I did not find it necessary, or notice a difference when they were on. I have left standoff screws in place however to put on on top, or levitate a alien input transformer with a different pinout instead.
 
R

Russellc

Member
Joined 2003
Paid Member
Tea-Bag said:
When I did not use shielded input wire I had hum, if the signal wire actually got to close to the edcor transformer (not so much the AC power transformer).

You will note that Nelson used a top shield on his. I did not find it necessary, or notice a difference when they were on. I have left standoff screws in place however to put on on top, or levitate a alien input transformer with a different pinout instead.
Click to expand...

I used 2 short sections of Silver Sonic BL-2 interconnect cable. It is shielded and no hum. Transformers are un shielded nude in all their glory.

Russellc
 
brianco

brianco

Member
Joined 2005
Off Topic and apologies.

I have a need for mono-bloc construction (probably with external PS.)

There was a rumour that the Shop may be stocking pre-drilled heatsinks, so in an attempt to hurry this along, I started a thread to gauge interest.

If you feel that you would rather build your own case/s but have the option to be able to buy suitable pre-drilled & tapped heatsinks please have a look at:

http://www.diyaudio.com/forums/pass-labs/287644-heat-sinks.html#post4634778

and add comment as appropriate.

Thanks.
 
nicoch58

nicoch58

Member
Joined 2004
Tea-Bag said:
JFET IDSS would be good ~8ma for each option.
Click to expand...
HI Tea-Bag thanks ,will be better as in ZM post that means R4 to 5R or better put a trim pot P3 like ?
535991d1457340021t-official-m2-schematic-p3.jpg
 

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