音響制作工藝 DIY Audio Craft

Kit: Pair Mono block Power amp 300B/PX25:-


Excellent 12mm thick Aluminium Alley Chassis
Hi-B Z9 EI Interstage transformer coupling
Hi-B Z11 C-Core 3.5k output trasnformer
350W Hi-B Z11 Mars Power transformer
Solen and M-Caps for main reservoirs
Black Ebony Solid wood legs
Full-Music Mesh Plate 300B tubes
EH 6s45pi gold pin driver tubes
China made 5U4G tube rectifier
0D3A
CMC pure silver RCA socket
CMC speaker Terminal
RA non-inductive resistors (made in USA) on audio path.
Resistors pack
Gold plated copper IEC socket
Switch, LED and misc pack
Installation insulation and assemble photo



Price: US$1599 (a Pair of Mono block)

Total weight: 16.5kg each block
Shipping: Each block is a package.
Surface Parcel cost: US$62-180 for most country, please quote.
EMS: US$160-280 for most country, please quote.

Order:-
By email me at: sale@vt4c.com
Fax: (852) 2495 3415
Your Name and shipping address
How many pair you order?
Email address and Contact phone number (for posting)

Payment method: Wire-transfer, direct disposit and Paypal only.

More Photos

Some internal photo of finished product.

For Audio Note preamp

Some pre-amp (Example: Audio Note M3) sound bad when connect to this kit. One major reason is some Resonance occurred. To solve it, add a 10k(0.25W or larger) resistor R11 in between input RCA and Grid of (V1) 6C45pi. Put it as close as to V1. That would prevent the resonance. So, add it when necessary, since any additional parts on signal path would downgrade the performance.

For High efficiency speaker

Since the kit don't have any feedback. Some high efficiency speaker may found some hum. Newer ordered kit already come with larger filtering capacitor (C4 changed 100uF+100uF, 500V). But it still not enough for 100dB or higher speaker.

Please add R12 (100ohm 5W, or 47ohm 2W, or 10H 100mA choke) and C5 (10uF to 100uF, 500V). That would reduce the hum level from 20mV to below 10mV.

請問如果我用Tango XE20s OPT 的2a3 single end可否裝在Hellfire case??

I think it can. Please check the screws on Tango: -
The screw holes on my chassis are: -
75mm center-to-center and 63.5mm center-to-center.
the ellipse shape holes are 6 x 13mm