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Old 15th March 2010, 01:13 PM   #111
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For I/V stage using 2 dual triod tubes how many PCB needed....?? 1 Simpler Simplistic + 1 Heater Power Supply PCB or 2 Simpler Simplistic + 2 Heater Power Supply ???
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Old 15th March 2010, 01:27 PM   #112
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Quote:
Originally Posted by gabanyayaya View Post
Quanghao

For I/V stage using 2 dual triod tubes how many PCB needed....?? 1 Simpler Simplistic + 1 Heater Power Supply PCB or 2 Simpler Simplistic + 2 Heater Power Supply ???
what the I/V stage do you want to say?? you like parallel 6h6??

2 simpler + 2 heater suppy you can sen last post.
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Old 15th March 2010, 01:29 PM   #113
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Quote:
Originally Posted by guglielmope View Post
Hello,
for 2 pcb there are 12 US$ of shipping costs?
We can start to pay?
When you will be ready to send the pcbs?
Ciao
Guglielmo
no! i answer you later, i ask post office!

thank
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Old 15th March 2010, 02:02 PM   #114
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Will it be possible to ship by air mail for extra cost?
How much will the shipping be to Israel, both surface and air mail?
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Old 15th March 2010, 03:58 PM   #115
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Quote:
Originally Posted by quanghao View Post
what the I/V stage do you want to say?? you like parallel 6h6??

2 simpler + 2 heater suppy you can sen last post.
quanghao

this is the I/V stage I'm talking about....
Click the image to open in full size.

Can I parallel 1 shunt & 1 heater psu board to each tube like in the circuit?
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Old 15th March 2010, 05:29 PM   #116
noizas is offline noizas  Lithuania
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gabanyayaya

I'm pretty sure to parallel one shunt regulator for both channels (L and R) is really bad idea, because of too strong crostalk between channels via same PSU source.
Even with white cathode follower which has strong PSRR, it is not good idea.
Your schematic however is symetrical totem pole amp, which has medium PSRR value.

regards
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Old 16th March 2010, 04:01 AM   #117
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Quote:
Originally Posted by gabanyayaya View Post
quanghao

this is the I/V stage I'm talking about....
Click the image to open in full size.

Can I parallel 1 shunt & 1 heater psu board to each tube like in the circuit?
In this Tube (6n2 or 12AX), use some mA. you can use one suppy for it.
But i dont like SRPP for DAC, i fin in my house, if i still have PCb SRPP, i will gift you, don't pay money.
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Old 16th March 2010, 05:26 AM   #118
noizas is offline noizas  Lithuania
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quanghao

Can I make Paypal transfer for 3 PCB in amount 3x30 USD, or I need to wait some options for postage cost?

Concerning gabanyayaya SRPP schematic - it shows like I/V ala Lampizator with 6N2P - one solution for I/V, amp and even buffer. If here is question of space in box, it is not worst solution, IMHO.
What is wrong with SRPP as I/V - can you share your experience?


gabanyayaya

Indeed you can use one shunt regulator as power suplly, but better substitute by it only diodes D1-D4 - leaving RC filters separate for L and R channels. This would be reasonable because even SRPP's upper tube works as CCS, this is true only if SRPP designed well - matched on specific Rload.
You can read about it here - The Tube CAD Journal,SRPP Decoded .

If you need to calculate SRPP, just please write me - s.navikas@zebra.lt, I will do it with TubeCAD for my pleasure.
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Old 16th March 2010, 07:52 AM   #119
regal is offline regal  United States
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SRPP sounds awful in a DAC, it is very load dependant. Just use a low Rp high gain tube in bypassed cathode with output from the anode. Use 6n6p or 5842 (for more gain), sounds much better than a SRPP, trust me I've tried many tube DAC stages.
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Old 16th March 2010, 10:45 AM   #120
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Simpler Simplistic design by Salas

A. Information about Salas shunt:
Simplistic Mosfet HV Shunt Regs

Thank you Salas
_______________
B. Information PCB
+ One PCB:
2 x Simpler Simplistic
2 x Heater Power Supply+ Quality:
two layers , gold-plated, 1.6 mm thickness

C. The price includes:

PCB + Shipping (surface mail) + fee PayPal :

1. PCB = 30$
2. PCB = 55$
3. PCB = 85$
4. PCB = 110$

Hi everyone. Current everything I was ready to submit designs for manufacturers to make circuits.

So you have registered, please let me transfer the funds to my order soon.

Time to receive funding to start from today to 16-3-2010
When I receiving funding will be made immediately,
on the 22-3 production was finished 2 4 - 2010
Then I will send the first day for all of you!

Thank you and please transfer money to my account
My papal account: quanghao168@yahoo.com.vn
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