Changsha Shuguang Audio Ltd.

Changsha Shuguang Audio Ltd.

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Shuguang 6550A-98(Kt88-98,GEKt88) new Hi-Fi tube

Shuguang 6550A-98(Kt88-98,GEKt88) new Hi-Fi tube Shuguang 6550A-98(Kt88-98,GEKt88) new Hi-Fi tube Shuguang 6550A-98(Kt88-98,GEKt88) new Hi-Fi tube
Product name:Shuguang 6550A-98(Kt88-98,GEKt88) new Hi-Fi tube
Item:SG-6550A-98
Price:$22
Details:
about this tube 
     The auction is for one tube.They are brand new tubes with excellent quality.

6550 6550A

Beam power tube 6550's(6550A)anticathode limite dissipation power is 35W(42W). In audio frequency amplifier, two tubes of A1 and AB1 driving output can get the power of 100W. At the same time, 6550(6550A)also can be used in electron firm voltage electrical route.



6550A


6550A-98
 

6550(6550A) is the same with KT88, and can be exchanged each other.

heater heating

UH
6.3
V
IH
1.6
A

limit rating

 
6550
6550A
V
plate voltage
600
600
V
second grid voltage
400
440
W
anticathode dissipation voltage
35
42
W
second grid dissipation power
6
6
MA
cathode current
175
190
V
first grid voltage
-300
-300
V
heater voltage between cathodes
+200
+200
V
 
-300
-300
 
first grid resistance
 
 
V
when it is self-partial voltage
0.25
0.25
when it is fixup partial voltage
0.05
0.05

capacitance between poles

input capacitance
15
PF
output capacitance
10
PF
transroute capacitance
0.85
PF

static state parameter

Ug
250
V
Ug2
250
V
-Ug1
14
V
Ia
140
mA
Ig2
12
mA
Gm
11
mA/v
ri
12
kn
Ia(max.sig)
150
mA
Ig2(max.sig)
28
mA
RL
1.5
kn
Pout
12.5
W
Dtot
7
%

commend working state(reference value)

single tube A1 amplify

Ua(b)
400
V
Ug2
225
V
-Ug1
16.5
V
Ia(0)
87
mA
Ia(max.sig)
105
mA
Ig2(0)
4
mA
Ig2(max.sig)
18
mA
Gm
9
mA/v
ri
27
Pout
20
W
Dtot
13.5
%
 


driving A amplify
working state(value of two tubes)
 

-------------
Ua(b)……………400 ---600  ----400V
Ug2………………275 ---300 ----300 V
-Ug1…………… 23 -----31 ----Rk=140ΩV
RL……………… 3.5- ----5- ----4.5 KΩ
Ia(0)……………2×90 -2×58--- 2×83mA
Ia(max.sig)… 2×135 -2×136 - 2×95mA
Ig2(0)………… 2×4.5 -2×2 ---2×3.6mA
Ig2(max.sig)… 2×22 -2×20.5- 2×19.5mA
Pout…………… 55 -----100 ----41 W
Dtot…………… 3 ------2.5 ----4 %

driving AB1 amplify
working state(value of two tubes)

-------------
Ua.g2(b)…………… 400 400 V
-Ug1………………… 40 Rk=525Ω V
RL…………………… -4-- 4 KΩ
ü(g1-g1.pk)…78 78 V
Ia+g2(0)……………2×76 2×76 mA
Ia+g2(max.sig) …2×80 2×80 mA
Pout…………………17 17 W
Dtot…………………1.5 1.5 %

driving AB1 amplify
working state(value of two tubes)

Ua(b)……………… 400 V
Ug2………………… 310 V
Rk……………………140 Ω
RL……………………5 KΩ
ü(g1-g1.pk)……… 43 V
Ia(0)……………… 2ⅹ85mA
Ia(max.sig)……… 2ⅹ92.5 mA
Ig2(0)………………2ⅹ5 mA
Ig2(max.sig)………2ⅹ12.5mA
Pout…………………40 W
Dtot…………………0.7 %
 


 

 

 

 

 
 
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