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Hello Jack,

They could be genuine Mullard E88CC from late 70s - early 80s, but they look reprinted to me. Philips use that type of logo in 50s - early 60s.

Have a nice weekend,

Dragan

By the way, you should ask for photos of boxes. These ones look genuine, but I doubt he has all eight the same.

Best regards!

Hello,

Sorry for slow reply, I had one broken Russian 6N8S by hand, but it took some time to dig Philips one out.

Here are a few photos, 6SN7GT Philips clear glass and 6N8S Russian 6SN7GT, side by side.

The differences are more than obvious.

Hope this helps

Dragan

Hello, Sorry for slow reply, I had a lot of spam topics meanwhile. The tubes you bought are Russian 6P3S, they are 6L6, but without GC sufix and it is very dangerous to use them instead real 6L6GC. They simply cant survive voltage higher than 250V on G2. My advice is to return them back and to buy s...

Hello, Actually the aren't rebranded, they are freshly branded new production KT77. The one on the left, Russian made, the anode is classic EL 34 anode made with RFT anode tools. It looks to me like a real EL34, but maybe the grids are different and I can't judge that just from one photo. The right ...

Hello,

The tubes are Russian ones (Electro Harmonix) and the boxes aren't printed in West Germany in 70s or 80s for sure, they are new boxes with registered trademark symbol.

Almost all old RSD boxes had "6 months warranty - 6 monate garantie" printed at the top.

Best regards!

Dragan

Hello, These ones are fresh reprints of Russian EL34. They look very similar to RFT EL34, which Telefunken used to rebrand in 70s and 80s. Genuine RFT Muhlhausen EL34 tools were offered to EI in late 80s, but they finished in Russia. By the way many big European manufacturers rebranded tubes in 70s ...

Hello,

Those ones are made in USSR, Orel tube plant.

6F1P is original designation.

Best regards!

Dragan