This is some amp. 40 kilograms. 845 power tubes. Blue
led indicators.
This is CHINA HIGH END folks.
It is like ONGAKU for the poor.
This is like 4 Angels in one amp.
Or more like Ben Jonhson of amplifiers.
Angel on steroids anybody?
Is it any good?
At the time of writing this must be the biggest amp value for 200 GBP
in the World.
LET'S EXAMINE IT !!!
It looks super cool. And super tasteless at the same time (by the way - a 3 K resistor dims these fucking ugly indicator backlight just nicely)
The chassis is super heavy and highendish.
The transformers are big, nothing like in the Music Angel MX845.
The anode voltage is a proper 1000 V DC, not like M.Angel "mere" 800 V.
Even the pot is a proper Alps.
Inside, the circuit is built on one of the most clean and good looking
PCB's I have ever seen. It is Coplandish so to speak.
POWER TUBE SOCKETS FROM UNDERNEATH.
Power supply PCB
INPUT CIRCUIT FOR 4 INPUT TUBES.
VERY HEAVY AND STRONG BOTTOM PLATE AND LEGS.
So far so good. Now how does it sound?
Out of the box it sounds very powerful, with huge bass,
attack and perceived power. But really dirty, muddy, congested.
Not High-end at all. If I didn't know how to tweak it - I would be
screaming with anger having this 40 kilo of monster in my living room.
Schematics
(provided in the box) reveals two pentodes used as input and driver
stage. But the sockets are octal, so proper triodes will fit.
I have disposed of the original chinese pentodes in the
dustbin IMMEDIATELY.
I installed the MA845 input stages from the Music Angel.
First goes the 6H9C (6N9P in Chinese marking, 6SL7 in USA)) triode used
in Lampizator mode - SRPP with two 680
Ohm resistors, and 68 KOhm resistor in the anode PS instead of the 180
K.
Current was 1,5 mA.
Second stage (via a new cap, not the original) was a paralleled triode
6H8C (Chinese 6N8P) (USA 6SN7GT).
It has 20 K in anode, and 340 Ohm in cathode.
All series resistors in the path were eliminated.
The current of the paralleled driver stage was 11 mA. (5,5 mA per
triode halve).
Liang's 845 new circuit by Lukasz Fikus
wiring diagram for new input and
driver stages
Comments
to drawings - PARTS:
C1 = 150-220 uF / 450 V
R1 = 10K : 15 K 2 W
V1 = 400:420 V DC
I 1 = 10 mA
V2 = 230 V DC
V10 = 350 VDC
R2 = 680 Ohm / 1/4 W
R3 = 200:500 K / 1/4 W
C2 = 0,22 uF : 1 uF / 250 V
C4 = 1uF:4uF/450V
V5 = 130 V
V5 = 130V
R6 = 47K:62K/1W
C3= 47uF:100uF/400V
R4=R5=680 Ohm /1/4W
V7=1V
V8=250V
R8=100K
V4=0
V3=7V
I3=80mA
The modified Liang (test prototype in dirty version.)
The PCB is already removed.
AND HERE IS
a
special schematic - supposedly much better
than mine - from a very
nice and knowledgeable man from Linz Austria - Dietmar Gerhold whom I
thank for sharing with us his good job.
Here is a
detailed description.
I
tried the schematics from Mr. Dietmar and I must agree. It sounds
better on bass, on width, on height, on depth, on details. Everything
is stable. There is no hum, no noise, no overheating of parts. It is a
top solution for today - June 14 2008.
I departed from the supplied schematics here and there by no more than
10 % because I used parts available. Apparently everything is OK.
Current below 4mA, voltages plus minus the same.
I recommend this mod over my
own proposal.
I am ready to forgive the Austrians the match against Poland.
This
is one High-End amplifier. I recommend it to anybody needing a powerful
SET on a 500 GBP budget (incl. shipping from Hong Kong).
Shuguang Electrical Factory No. 1
Owned by Korean firm Samsung. Shuguang makes most of the popular audio and guitar types, which are frequently rebranded by importers and OEMs. Types believed in production: 6L6GC, EL34 (3 types), 6550, KT100, 5AR4, 2A3, 807. Possibly 211, 845. The price is circa 170 USD per pair plus shipping. Close matching is unnecessary.
