ELEKIT TU-8550 PRE-AMPLIFIER

[vkung]

I will receive the sample from Lundahl early next..
It should be $300-$400.

 

[vkung]

just received the sample

 

[vkung]

Attached is a suggested connection for LL1570, used for unbalanced-> unbalanced output from preamp

 

[vkung]

Thank you Eryn to design the PCB for this project

 

[Ayaka]

Any thoughts with Lundahl upgrade?

 

[vkung]

it is ready but i need time to test the result..

 

[Fumitoshi]

Good evening Master

How much is the tu8550 right now ? And do you know what capacitors is the audio research using in their preamp .

Thank you

 

[vkung]

$1175 included 6 JJ tube set (12AX 7 X 4 + 12AU7 X 2)
There are 4 coupling caps
I offer Jupiter copper 0.47 X 4 $60 each
Shipping via DHL is $65 to Major cities in USA

 

[rts1955]

How does someone make a purchase from you. Looking to buy the Elekit TU8550 and TU8900 w/ Transformer upgrade.

 

[vkung]

go to my web site to send me what you want.
I will send you a Paypal invoice to confirm what you would like to order
or you can send your request to info@vkmusic.ca
I have both in stock

 

[dcgibby]

Any word on the Lundahl upgrade for the 8550?

 

[vkung]

I do not have time to make the box.

Lundahl LL1570XL X 2 + PCB X 2 + Phoneix Terminal Blocks (6 pins) x 4 are available $230 plus shipping
If you do not want the Phoneix TB, you can deduct $15

 

[vkung]

Lundahl LL1570XL X 2 + PCB X 2 + Phoneix Terminal Blocks (6 pins) x 4 ( No Screw)

 

[dcgibby]

What box is needed? Won't these replace the existing xformers at the existing location?

 

[vkung]

there is the output transformer to connect between the preamp and power amp

 

[Colinos]

It lives! It was longer than planned because l got Covid on the plane back from France. Then I caught the flu! I will break it in on the bench.

 

[rts1955]

I am building TU-8550 pre-amp. I installed D306(RBA406) wrong. Turned power on( did not turn on). I installed D306 correctly. Turned power on. Led 301 and Led 302 turned on. I think I heard a click, then U301(LM555P) smoked. I plan on replacing U301(I have part) and D306. I can not find RBA406 on line. Can you tell me any replacement part numbers or do you sell them.
Is there anything(parts) I should check Thank You Ronald

 

[vkung]

Do Not worry.. I will check my parts inventory.. email to my email info@vkmusic.ca

 

[Catcherfly]

Has anyone upgraded the volume and/or balance controls on the TU-8550?​

I have the Sunvalley SV-Pre1616D and am wanting to upgrade both controls.
Considering a Goldpoint or Intact Audio attenuator for the volume control but haven’t been able to find many balance controls options online. Just these: https://partsconnexion.com/products/audio-note-100k-ohm-stereo-balance-potentiometer

http://www.analogmetric.com/goods.php?id=2471

Anyone have any thoughts on this?

 

[dcgibby]

My 8550 is dead quiet and the volume and balance pots are accurate and smooth. I'm not sure what you would gain from an upgrade. I think the only way I would swap these out is if the originals started to fail.