High voltage + filament Regulated power supply board for Tube preamp DIY L12-41

Description

Board size:  153mm*113mm*32mm  (W*L*H)
Installation opening holes distance is 141.224mm*100.584mm.
this Power supply circuit is base from the conrad-johnson preamp power supply part. so we are not have the schematic for it.
The board default seting as following:
High voltage: DC280V    (  high voltage can be adjust between 180-350V. )
filament Voltage:  about DC6.3V  ( it can be adjust between 1.5V-12.6V)
High and low voltage start-ups are slowly superimposed, that is, soft start, so that the impact on the gallbladder is less.
Note:
1: Especially for the novice to explain, this high voltage AC input is need add a transformer, can not directly input the city main power 110V or 220V!
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2. From the regulation performance and power consumption heat, we must control the voltage difference (20V or so is ideal): for DC250V input AC200V is good , For DC280V , AC230 is good, for DC300V , AC260 is good.
(
Calculation formula：
input AC*1.4-output DC=20-50mV）
3. The
Main capacitor
of this board is 400V voltage. Please note that the input voltage should be controlled below AC280V.
on this board the LM317K are used. it is 100% origianl and works in good
performance.
Shipping time:
Default send by airmail,about 15-22 business days can arrive most of europe countries, Russia, Brazil,Africa.Ukraine and some other remote countries will need some more days.
If you need it urgently,also can contact us for adding money using a faster courier(EMS,DHL,UPS or courier you designated)
Payment:
We ONLY accept PayPal. Payment must be made within 3 days of the auction end time. Non-Paying bidders will be reported.
All items will be shipped within 1-3 business days (from china)upon receipt of payment.
We ONLY send item to buyer's registered Paypal address,Buyer must be responsible for their postal address
Customs & duties:For cross-border transactions,.we are not responsible for tariffs and duties. However, buyers may be responsible for  actual, applicable tariffs, and duties as requested by respective country laws
Return & Exchange:
>> Some items return is accepted within 7 days after the buyer's receiving the item.(please see the detail describe)[In case of DOA (Dead on Arrival), please report within 3 days]
>> Returned item has to be new, unworn and in its original condition.
>> After getting the returned item, we will refund the customer at the item's price ( excluding the shipping costs to and from )
On Dec-28-18 at 04:43:25 PST, seller added the following information: