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6GB8 and 6CA7 NOS tubes

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VladimirK

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Joined 2007
#1
I offer NOS japaneese EL34-like tubes - 6GB8 (Toshiba) 4pcs and 6CA7 (Matsushita) 4pcs. They came some years ago as spares with a big scientific instrument. There are also used 6GB8 tubes, pulled out from that instrument.
6CA7 is more similar to EL34 with 27W plate maximum dissipation, while 6GB8 is more powerful (35W) and better sounding, it close to 8417 tube.
The Toshiba 6GB8 are extremely rare and highly reqested. If needed, I could do some measurements, of both NOS and used tubes.
Prices:
NOS 6GB8 set of 4 pcs: 360USD per set, worldwide fast shipment included
NOS 6CA7 set of 4 pcs: 100USD per set, shipment is to be added

USED 6GB8 set of 8 pcs: 100USD per set, shipment is to be added

Payment is via Western Union, bank expences are paid by the Buyer.
 

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Last edited:
#4
dady said:
Hello!
I can pay 150 us for a new set of 6GB8.
Happy new year Vladimir
Click to expand...

OK, I could offer 300USD per NOS quard 6GB8 Toshiba, fast shipment is included.
(podria ofrecer una rebaja del precio hasta 300 dollares, puedo hablar un poco espanol, gracias por tu oferta).
These tubes seem to produce magician effects on guys from Asia, Toshiba 6GB8 are claimed to be undoubtedly better than any version of el34 - 6ca7.
 
#5
In addition to the previous offers, I add the following:
NOS Matsishita S2001 penthode (6146 tube equivalent) - 4 pcs available
30USD per 1 pc
Packing is similar to that of 6ca7 at post's #1 picture.
These tubes were used frequently at old radios design.
 
#6
I have done some measurements of some tubes offered above.
Just take a chance to select the best quard.

Triode mode measurements
Heater voltage 6,4V DC
Heating-up period used is 1 min
Grid1 to Cathode voltage = 0
Grid2 connected to Plate via 50 Ohms
Plate voltage_1 = 140V
Plate voltage_2 = 149V
Corresponding plate currents are indicated

6G-B8 used tubes
No1 152mA 166mA
2 184 202
3 156 172
4 182 199
5 174 190
6 161 176
7 171 189
8 144 159
9 181 198
10 159 175
11 198 216
12 154 170
13 162 177
14 167 181
15 174 191
16 193 210

6CA7 NOS tubes
No1 166mA 179mA
2 158 170
3 158 170
4 160 172
5 161 173
6 136 144
 
#8
dady said:
That mean they are.... ? I didn't know the normal values in this, could you tell us?
Best Regards and thanks for your effort
Click to expand...

These measurements proove that emission of the used 6GB8 is indistinguishible (in average) from emission of the NOS tubes. As per 6GB8 datasheet at triode mode (picture at the first post) Vg1=0 and plate voltage 140V one should have 165mA.
 
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