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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Thu 16, 2015 7:54 pm 
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Flipperhome wrote:
Pbpix wrote:
Flipperhome wrote:
All I can say is the datasheet says 10K for 10 Watt and every commercial amp maker used 10K (when B+ was 250 V).

Did you look at the 2nd screen-shot I posted for 15v bias?
I said " Something MUST have changed because it NOW shows 11 watts"

entering 10k made the power drop.... so it peaked at 8k.
Maybe chuck knows why.

Scroll back up 4 posts.
Yes, I saw it and my post stands. The datasheet says 10K for 10 Watt and every commercial amp maker used 10K (when B+ was 250 V).

I understand and I agree... I'm only able to move the numbers around in the program..and observe the results.
.... but if Chuck wrote it he'd be best to try to help explain it.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Thu 16, 2015 7:56 pm 
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john8750 wrote:
Pbpix wrote:
Hey John:
I was in Michale's Stores yesterday looking for plastic parts bins boxes ( found nice ones on sale for $4.49.)
... and then I saw these basswood frames 9 x 6 x 1-5/8"

I thought I might make a box top and bottom out of two of these if I hinge them in the back. That would be a bit over 3" deep.

So I got two.... mostly to give me a little more space on the top for those large octal 6V6G tubes and the two OTs.
( I'm also going to mount four 7-pin sockets in parallel with the four octal sockets to allow a choice of using 6AQ5 tubes instead.)

I stained them tonight and have the hinges all ready.

Of course I'll need a thin brass strip in the front (with the wood cut out behind) so I can mount the output jacks and input etc along with the on/off lamp and a slide sw to opt for 6v @450ma or 12v @225ma filaments if I want to use some 12V6 tubes.

Image


Great idea Peter. I like the two halves hinged. We need the bottom room for those two coke can size caps.
I meant to call you tonight but really busy at work.

Maybe you can help us find some smaller ones 470uf at maybe 300 or 350v?

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Thu 16, 2015 8:38 pm 
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Pbpix wrote:
john8750 wrote:
Pbpix wrote:
Hey John:
I was in Michale's Stores yesterday looking for plastic parts bins boxes ( found nice ones on sale for $4.49.)
... and then I saw these basswood frames 9 x 6 x 1-5/8"

I thought I might make a box top and bottom out of two of these if I hinge them in the back. That would be a bit over 3" deep.

So I got two.... mostly to give me a little more space on the top for those large octal 6V6G tubes and the two OTs.
( I'm also going to mount four 7-pin sockets in parallel with the four octal sockets to allow a choice of using 6AQ5 tubes instead.)

I stained them tonight and have the hinges all ready.

Of course I'll need a thin brass strip in the front (with the wood cut out behind) so I can mount the output jacks and input etc along with the on/off lamp and a slide sw to opt for 6v @450ma or 12v @225ma filaments if I want to use some 12V6 tubes.

Image


Great idea Peter. I like the two halves hinged. We need the bottom room for those two coke can size caps.
I meant to call you tonight but really busy at work.

Maybe you can help us find some smaller ones 470uf at maybe 300 or 350v?



I will send out an APB right away....
How about using two 220s, 450 volt. They are about half the size.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Thu 16, 2015 8:50 pm 
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john8750 wrote:


I will send out an APB right away....
How about using two 220s, 450 volt. They are about half the size.

Sure... anything physically smaller.
maybe two 220 @350v in parallel
or 3 x 150uf @350v or 450v in parallel.
or
two 820uf@ 200v or 250v in series.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Thu 16, 2015 8:59 pm 
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Pbpix wrote:
john8750 wrote:


I will send out an APB right away....
How about using two 220s, 450 volt. They are about half the size.

Sure... anything physically smaller.
maybe two 220 @350v in parallel
or 3 x 150uf @350v or 450v in parallel.
or
two 820uf@ 200v or 250v in series.



I found these.

http://www.ebay.com/itm/Qty-10-47UF-350 ... 0685439630


Price is a little high. I like the leads better.The ones we have will fit fine if you want to use them. I have plenty of room.
I will still look. And I can order those, and send a couple to you..

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Thu 16, 2015 10:30 pm 
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john8750 wrote:
Flipperhome wrote:
Yes, I saw it and my post stands. The datasheet says 10K for 10 Watt and every commercial amp maker used 10K (when B+ was 250 V).
Well, I am stuck with 8K.
How come?

At any rate, 8K is the right impedance for UL and that's what I though you were going to use.


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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Fri 17, 2015 1:01 am 
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john8750 wrote:
Pbpix wrote:
john8750 wrote:


I will send out an APB right away....
How about using two 220s, 450 volt. They are about half the size.

Sure... anything physically smaller.
maybe two 220 @350v in parallel
or 3 x 150uf @350v or 450v in parallel.
or
two 820uf@ 200v or 250v in series.



I found these.

http://www.ebay.com/itm/Qty-10-47UF-350 ... 0685439630


Price is a little high. I like the leads better.The ones we have will fit fine if you want to use them. I have plenty of room.
I will still look. And I can order those, and send a couple to you..

Those are ONLY 47uf we want 470uf

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Fri 17, 2015 1:02 am 
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Flipperhome wrote:
john8750 wrote:
Flipperhome wrote:
Yes, I saw it and my post stands. The datasheet says 10K for 10 Watt and every commercial amp maker used 10K (when B+ was 250 V).
Well, I am stuck with 8K.
How come?

At any rate, 8K is the right impedance for UL and that's what I though you were going to use.

Maybe John was getting a little confused with the last few posts?

Yeah John... were are using UL (8k) and that's what I think you ordered ...right ? ..8k.
I did.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Fri 17, 2015 8:27 am 
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Sorry about the confusion. I will continue looking for the caps.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Fri 17, 2015 9:02 pm 
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That's what I have on order Peter. Thanks.
Will send you some cool stuff soon.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sat 18, 2015 10:51 am 
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Yesterday I shellacked, and varnished the box w/wipe on polly. Looks oh-so nice.
The basswood top is very very thin... 1/8" maybe.

Tonight ...I carefully used a 5/8" and a 1" spade-drill to cut the 4 holes for the four 7-pin sockets and the four octals.
I'll have 6v6 tube sockets wired in parallel with 7-pin 6AQ5 sockets so as to have an either/or alternate tube choice.

I used a Black&Decker little battery powered hand drill and it turned at the perfect speed. I taped over the top to protect it and also started drilling up from the underside 1/2 way and then from the top down. Wow... perfect hole. Nice.

But since I'm mounting the octal sockets underneath, .... the hardware on top stopped the octal tube base from going into the socket all the way. So I had to file 1/2 the heads off to make it fit... arrrgh.
But it worked.
I did one octal and one 7-pin socket... the rest tomorrow.

Headway.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sun 19, 2015 12:22 am 
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Here's last night's progress. Tonight I'll attack it a little more :lol:
Image

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sun 19, 2015 12:29 am 
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The 220uf 160v Panasonic caps arrived. Installed last night ... all's well, no heat, works good.
I played the amp about 6 hours last night. Stable everywhere. Each night for the last week or so it plays on the bench for 3 - 6 hours no variations in voltage or anything. Very steady.
B+ = 268V - 270v with only 75 mv pp ripple ... depending on line voltage changes late at night ( 122vAC - 123vAC)

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Last edited by Pbpix on Apr Sun 19, 2015 6:49 am, edited 1 time in total.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sun 19, 2015 5:13 am 
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Pbpix wrote:
The 202uf 160v Panasonic caps arrived. Installed last night ... alls well, no heat, works good.
I played the amp about 6 hours last night. Stable everywhere. Each night for the last week or so it plays on the bench for 3 - 6 hours no variations in voltage or anything. Very steady.
B+ = 268V - 270v with only 75 mv pp ripple ... depending on line voltage changes late at night ( 122vAC - 123vAC)



Excited to see your progress Peter. Why did you stagger the tube sockets? That's neat.
The real test of good wood is the smell before the finish goes on.
Is that 202uf capacitor critical? Or was it very late at night.
I will start my chassy soon. Today, I bought some red oak for the ends of mine. They will be glued on with liquid nails.
Please share your ideas for the preamp and CCs boards. And OT mounting....

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sun 19, 2015 5:25 am 
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Just wondering. The power supply rectifiers, Ok to use uf4007s?
I have a good supply of them.
I am going shopping for parts tomorrow.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sun 19, 2015 6:57 am 
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john8750 wrote:
Pbpix wrote:
The 202uf 160v Panasonic caps arrived. Installed last night ... alls well, no heat, works good.
I played the amp about 6 hours last night. Stable everywhere. Each night for the last week or so it plays on the bench for 3 - 6 hours no variations in voltage or anything. Very steady.
B+ = 268V - 270v with only 75 mv pp ripple ... depending on line voltage changes late at night ( 122vAC - 123vAC)



Excited to see your progress Peter. Why did you stagger the tube sockets? That's neat.
The real test of good wood is the smell before the finish goes on.
Is that 202uf capacitor critical? Or was it very late at night.
I will start my chassy soon. Today, I bought some red oak for the ends of mine. They will be glued on with liquid nails.
Please share your ideas for the preamp and CCs boards. And OT mounting....

202uf is very rare.
but yes it was morning when I hit the sack.. sun was up.

I staggered them initially because the 6v6G coke-bottle tubes would have been too crowded. But then when I decided to add the 7-pin sockets it all made more sense. And it looks cool... :mrgreen:

My OTs will be placed behind the tubes evenly spaced but nearer to center.

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Last edited by Pbpix on Apr Sun 19, 2015 7:06 am, edited 1 time in total.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sun 19, 2015 6:59 am 
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john8750 wrote:
Just wondering. The power supply rectifiers, Ok to use uf4007s?
I have a good supply of them.
I am going shopping for parts tomorrow.

Sure UF4007s are great as rectum-fryers. Just fast recovery.

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sun 19, 2015 7:00 am 
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Ok here's what I got done tonight:
I only had steel-colored 4-40 screws for the 7-pin sockets and large brass washers. I think 2morrow I may try to get some less conspicuous-looking, more appropriate-sized brass 4-40 screws and smaller washers for them.

Image

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sun 19, 2015 10:50 pm 
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Hi John, I usually look under the category Bussines and Industrial on ebay. Here`s some Nichicon at a good price.

http://www.ebay.com/itm/301252157988?_t ... EBIDX%3AIT


Hi Peter That`s a nice looking set up!

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 Post subject: Re: 6V6 / 6AQ5 PP Stereo Amp
PostPosted: Apr Sun 19, 2015 11:15 pm 
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drmitch wrote:
Hi John, I usually look under the category Bussines and Industrial on ebay. Here`s some Nichicon at a good price.

http://www.ebay.com/itm/301252157988?_t ... EBIDX%3AIT


Hi Peter That`s a nice looking set up!

Thank you drmitch.

We are looking for a smaller physical sized caps .. like 470@350v cap.
All we have so far are really fat "coke-can" 470uf@450v

These look great but too expensive:
http://www.ebay.com/itm/Condensateur-ch ... 27ccb8a8ed

... I just saw these, (.75" x 1.75") but we'd need to put two in series to get 410uf@320v .. so I am not sure if we'd save space. But the price is good $2.39 cents each:
http://www.ebay.com/itm/QTY-5-820uf-160 ... 19fe0ebdd4

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