Mainline Build Questions

Allen,

Yes, only Formbys Tung Oil, high gloss....no stain in the product.

It does darken the wood, but not anwhere like a minwax dark stain or other staing products.

I was looking for a more natural lighter finish and an easy method...this one works well...

Several thin coats, dries fast, each day I completed the woring etc I would re-sand and apply anther coat.

The more u apply the more gloss it gets.

Alex
 
Ok!

We are done except for the resistors that hopefully will be here on Tuesday....gives me a chance to walk away and come back and re-check everything.

Even with the 49.9 ohm resistors not on the c4S boards the resistance checks look ok.

Its a great looking layout when you see it all together!

4 coats of the Formbys Tung Oil looks really nice to me, just the right amount of gloss and very smooth to the touch...This was a lot easier than using the dark stain minwax on the Crack IMO.

Stay tuned, music on Tuesday!

Alex


Note: I did remove the springs and ball bearing on the coarse and fine volume pots...way too much force for me, with one side removed on each the adjustments become very smooth IMO.










 

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MUSIC!!!

Smile!

Got the resistors today popped them in, voltages checked out ok.

Driving the Mainline with a Schitt Bimby MB dac...sounds great, all switches seem to work ok.

Its a great feeling when things wokr first time!!

Be back with a detailed "review"....

Alex

:>)

 
Paul, Doc...

On the front of my Mainline Power Xfmr there are some noticeable Lines or more of droolings of waht looks like the sticky stuff that coats the transformer
laminations...its in the front side and quite visable.

Is there anything I can carefully apply to take this sticky stuff off??

I tried some alcohol on a q-tip but it doesnt touch it...

Maybe some acetone?? Carefully used?

Alex
 
You don't want to take the sticky stuff off, it's integral to proper operation of the transformer.

You can very lightly sand the high spots down a bit, but I'd recommend putting more  varnish over the lamination stack when you're done.
 
Paul,

I see in a tube manual for the 6C45pi the plate voltage is spec's as 150 volts.

145 v is pretty close to this, but was wondering why the 5 v delta?

Alex
 
The plate voltage in the Mainline is set to maximize output power.  Since there is some bias voltage on the cathode, the actual plate voltage is a bit lower.
 
The voltage is chosen to match the available positive and negative plate voltage excursions, based on the regulated 225v supply. That 225v is chosen to allow reasonable power line fluctuations without losing the regulation, and without excessive heat dissipation in the regulator C4S's plate load. (The power supply is the same as the Eros.)

I didn't see PB's post before I wrote mine, so apologies for the overlap.
 
Thanks for the explanation. Makes sense to me.

Question is it ok to connect two sets of headphones at the same time, one SE and the other Balanced??

or is this not a good idea?

Alex
 
Oops, I thought I answered this, sorry for the delay.

It would be best to use either the 1/4" jack or the 4 pin jack.  It's not a problem to split the output of either provided you are using two identical pairs of headphones and their impedances are reasonably high (I'd try to stay over 50 Ohms if possible). 
 
adydula said:
Thanks for the explanation. Makes sense to me.

Question is it ok to connect two sets of headphones at the same time, one SE and the other Balanced??

or is this not a good idea?

Alex

I don't think you will get quadraphonic sound that way

:-)
 
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