Welcome to my Tubes calculator.
This program helps with calculating the output inpedance and gain for the most common
tube configurations: Cathode Follower, Common Cathode, SRPP and Mu-Follower
This Excel program is free for personal and non-commercial use.
Hope you enjoy it like I do (when I forget the most simple formulas again)
(c) Maarten@Platenspeler.com
Aug-04
Lookup 13 Tube Va Vg1 Ia Ri S
6N6P
Tube Name: 6N6P 6N6P 230 -2 0.01 1800 11.2
GKS Config Rp Rk1 -- Rg Cmiller Rout
Common Cathode stage 120000 0 470000 7.94E-11 1773.40
Note: Rk1= 0 when Cathode Rk fully bypassed
GAS Config -- Rk -- Rg Cmiller Rout
Cathode follower 10000 470000 6.82E-12 78.26
Note: Rk1= large, Rp in general not present
SRPP Config ttl Rp Rk1 Rk2 Rg Cmiller Rout
Type SRPP a1 16060 620 620 10000 4.20E-11 8030.00
Note: Rk1= 0 when Cathode Rk fully bypassed
SRPP Config ttl Rp Rk1 Rk2 Rg Cmiller Rout
Type SRPP k2 15440 620 620 470000 4.05E-11 934.74
Note: Rk1= 0 when Cathode Rk fully bypassed
Mu-Follower Config ttl Rp Rk1 Rk2+Rp Rg Cmiller Rout
1050760 0 47680 470000 7.70E-11 80.95
Note: Rk1= 0 when Cathode Rk fully bypassed
u Cga
22 3.5E-12
V V(db)
21.67 26.72
V V(db)
0.95 -0.45
V V(db)
11.00 20.83
V V(db)
10.58 20.49
V V(db)
21.01 26.45
Index Nr 5 Tube Va Vg1 Ia Ri
1G6gt
Tube Name: 1G6gt 1G6gt 90 0 0.001 45000
Config Common
Cathode 15000
Rg 470000
Rk1 0
Rp 15000
Rout 11250.00
V 7.5
V(db) 17.50 1G6gt
Cmiller 2.38E-11
S u Cga
0.675 30 2.8E-12
Lookup 13 Tube Va Vg1 Ia Ri
6N6P
6N6P
Tube Name: 6N6P 250 -2 0.01 1800
SRPP Config
Type SRPP a1 6N6P
Rg 100000
Rk1 620
Rk2 620
ttl Rp 16060
620
Rout 8030.00
V 11.00
V(db) 20.83
Cmiller 4.20E-11
6N6P
620
S u Cga
11.2 22 3.5E-12
Gain: 11.00
Lookup 7 Tube Va Vg1 Ia Ri
5755
5755
Tube Name: 5755 110 -0.95 0.0022 140000
Config Mu Follower
Rg 2200000
Rk1 620
Rk2 620
Rp1 47000
Rk2+Rp1 47620 620
ttl Rp 3473400
Rout 8752.83
V 65.62
V(db) 36.34 47000
Cmiller 9.33E-11
620
S u Cga
0.5 70 1.4E-12
Index 7 Tube Va Vg1 Ia Ri
Tube Name: 5755 5755 110 -0.95 0.0022 140000
110
---
Config Cathode
Follower Ri
140000
Rg 470000
Rk1 10000
Rp --- 5755
2.55E-12
Rout 1971.83
V 0.82
V(db) -1.69
Cmiller 2.55E-12
470000 10000
S u Cga
0.5 70 1.4E-12
Gain
0.82
R_out
1971.83
Data
Tube Va Vg1 Ia Ri S u Cga Check
12AX7 250 -2 0.0012 62500 1.6 100 1.70E-12 1000.00
12SL7GT 250 -2 0.002 44000 1.6 70.4 3.50E-12 1000.00
12SN7GT 250 -8 0.009 7700 2.6 20.02 3.90E-12 1000.00
1G4gt 90 -6 0.0023 10700 0.825 8.8 2.80E-12 1003.13
1G6gt 90 0 0.0010 45000 0.675 30 2.80E-12 1012.50
5751 250 -3 0.001 58000 1.2 69.6 1.40E-12 1000.00
5755 110 -0.95 0.002 140000 0.5 70 1.40E-12 1000.00
6922 90 -1.2 0.0015 2650 12.5 33.13 1.40E-12 1000.00
6DJ8 90 -1.3 0.015 2650 12.5 33 1.40E-12 1003.79
6N1P 250 -2 0.0180 4400 7.5 33 1.60E-12 1000.00
6N1P_b 250 -2 0.0180 7500 4.5 35 1.60E-12 964.29
6N1P_c 250 -2 0.0180 11000 3.2 35 1.60E-12 1005.71
6N6P 230 -2 0.0100 1800 11.2 22 3.50E-12 1000.00
6SL7 250 -2 0.002 44000 1.6 70.4 3.50E-12 1000.00
7586 75 -1 0.0105 3000 11.5 35 2.20E-12 985.71
ECC81 250 -2 0.0010 11000 5.5 60.5 1.70E-12 1000.00
ECC83 250 -2 0.0012 62500 1.6 100 1.70E-12 1000.00
ECC85 250 -2 0.010 9700 6 58.2 1.50E-12 1000.00
ECC99 180 -4 0.0180 2300 9.5 22 5.10E-12 1000.00
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Data
Family Remarks Keep this list sorted on Tube Name
12AX7
6SL7
12AX7
6DJ8
6DJ8
6DJ8 Svetlana (tmp)
6DJ8 old datasheets
6DJ8 Frank Philipse
6SL7
12AX7
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