Chinese 6N1 tube replacement

[Bangla H]

zaridan,
that is a good dealer i have bought any different tubes and parts.
There are different productions and not to expensive.
In a Hybrid amp 6N1P works great in srpp on ~ 320V Ua.

 

[william3277]

I have a yaqin mc10l and i have been using ecc85 in palce of the 6n1 they sound a lot better than the stock tube. I had my amp 4years and thats how long the ecc85 have been in the amp

 

[6A3sUMMER]

My Chinese is bad, but the 6N1 data sheet seems to have the following data:
u about 35
Transconductance about 4500 uMhos
Plate Resistance about 7700 Ohms
Heater 600mA

That is very similar to the many Svetlana 6N1P that I purchased before they were no longer available. I like and use the Svetlana in some amps.

The 6DJ8, and ECC88, etc. are not like that at all.
u about 33 (the closest similarity to 6N1 and 6N1P)
Transconductance about 12,000 uMhos
Plate Resistance about 2750 Ohms
Heater 365mA
They also have a much lower maximum plate voltage, as well as a lower maximum filament to cathode voltage rating.
6DJ8 has 2 filament to cathode voltage rating, one voltage rating for triode #1, and another voltage for triode #2

You mileage in your amp may vary.
Plug and Play tube rolling can become Plug and Pray.

 

[kodabmx]

The plate voltage of the 6DJ8 is likely so low as to not exceed hk voltage in cascode, after all that's what they were designed to do. I've used 300V B+ with them without issue, although I avoid using them due to cost. You could try a 6N6P.

 

[6A3sUMMER]

Sometimes there are surprises in tube data specifications.

1. From the RCA 6DJ8/ECC88 and the Sylvania 6DJ8 Data Sheets:

Heater-Cathode Voltage: Unit No. 1 Unit No 2
Peak Value ———— 150V
Average Value 50V 130V

Unit 1
Plate Pin 6
Grid Pin 7
Cathode Pin 8

Unit 2
Plate Pin 1
Grid Pin 2
Cathode Pin 3

This tube was made for Cascode operation, but be careful:
Unit 1 is supposed to be the bottom tube in the Cascode (or SRPP)

The highest average voltage on Unit 2 cathode is 130V.
The highest Peak voltage on Unit 2 cathode is 150V.

The New Old Stock Tubes should not be used above the old ratings.

2. One new production of a tube that is Very similar to a 6DJ8/ECC88 (the E88CC) has the following limiting specs:
U+k/f- = 120V
U-k/f+ = 60V