HQ-IV tube output balance DAC

[jonwhitear]

i use transformer ouput: 220V.

so DC for HV ~295- 300 VDC.

you use 240 V??

I don't have a transformer yet. I can easily get one with 240V secondary. Can I have a 220V B+ with a 240V transformer?

 

[quanghao]

I don't have a transformer yet. I can easily get one with 240V secondary. Can I have a 220V B+ with a 240V transformer?

yes, it is easy with trimmer one board No,shunt

thanks

 

[Ryssen]

Quanghao: Yesterday I ordered 1 pcb HQ-IV tube output from your store,but
does it come with the PSU board the No shunt pcb?
Or where do I get it?

 

[mvictor69]

Dear Quanghao,
I haven't heard from you since I have resent mu data to you by e-mail. Can you please update me? Thank you

 

[quanghao]

Hi mvictor69!

I have prepared for your PCB.
I'll send it tomorrow, along with your following 2

hartbigsky
Ryssen
thanks

 

[quanghao]

Quanghao: Yesterday I ordered 1 pcb HQ-IV tube output from your store,but
does it come with the PSU board the No shunt pcb?
Or where do I get it?

ok, no problem, i sent you with pcb supply, and you payment me later.
thanks

 

[Ryssen]

and you payment me later.

How much is it,and whats your paypal adress?

 

[jonwhitear]

Quanghao, there are jumpers on the PSU board at H1 and H2 that allow you to connect the filament ground to the HV ground (H1) or to HV +70V (H2.) I understand this is to keep the voltage differential between the tubes' heaters and cathodes within spec, but none of the pictures on this thread have shown people connecting them. You mentioned it in post #209.

Is it best to connect H2?

 

[quanghao]

i see all the sample. please simple connect -F to GND HV!

thanks

 

[Ryssen]

can´t find upc1237 and LT1764 at mouser,di anyone else find them there?

 

[jonwhitear]

can´t find upc1237 and LT1764 at mouser,di anyone else find them there?

You'll need to resort to eBay for the upc1237. The LT1764 is standard, so should be available through mouser etc.

http://au.element14.com/linear-technology/lt1764aet-pbf/ic-ldo-reg-3a-ln-to220-5/dp/1663484

 

[frankwilker]

Hi Quanghao,
i payed 70 USD for the boards at 31th of Mai with PayPal.
i send you a PM, but got it back, cause your account exceeds?

regards Frank Wilker

 

[Ryssen]

This is what I get at Mouser:
http://www.mouser.se/Search/Refine.aspx?Keyword=LT1764

 

[quanghao]

Hi Quanghao,
i payed 70 USD for the boards at 31th of Mai with PayPal.
i send you a PM, but got it back, cause your account exceeds?

regards Frank Wilker

hi!

you can not payment it ??


thanks your advice
quanghao

 

[quanghao]

Hi mvictor69!

I was sent tou agian PCB = 2 x PCB IV + 2 PCB No,shunt.
if this time you can not get them, i will not sent again.

thanks you very much.

And i was snet for:

hartbigsky: 1 x HQ IV
Ryssen : 1 X hq iv + 1 X no.shunt

thank all
quanghao

 

[quanghao]

latest schematic No.HV shunt

modify the values according to the latest schematic below.

thank you

 

[Ryssen]

Is it true that you lose about 140v in the HV regulator?
I got one trafo with 240v AC
and one with 260v AC
will either of them work?

 

[jonwhitear]

Is it true that you lose about 140v in the HV regulator?
I got one trafo with 240v AC
and one with 260v AC
will either of them work?

I'm using a 240V taro, and seems to work fine for me. I haven't finished the I?V board yet, but I've hooked the filament and HV transformers up to the SPU board and both work OK, i.e. I've adjusted the filament supply to 12.6V, and the HV to 220V.

 

[mvictor69]

Hi mvictor69!

I was sent tou agian PCB = 2 x PCB IV + 2 PCB No,shunt.
if this time you can not get them, i will not sent again.

thanks you very much.

And i was snet for:

hartbigsky: 1 x HQ IV
Ryssen : 1 X hq iv + 1 X no.shunt

thank all
quanghao

Thank you. I hope it will arrive this time.
Victor

 

[mvictor69]

Dear Quanghao,
I have received today the 2 sets of PCB. They are excellent quality. Thank you.
Victor