GU-81M High Power Pentode

Russian Military HIGH POWER 750W PENTODE Tube. GU-81M (ГУ-81М - Генераторный Пентод) is Made in Russia (USSR) and was designed especially for military equipment.

The price is for 2 (TWO) used tubes GU-81M. ALL tubes for sale here are in USED condition. I tested their filaments with an ohmmeter and under nominal voltage and they are 100% working. The tubes may work very well, or they may be very weak, but I expect all of them to be in some sort of working order.

GU-81M are interesting looking tubes, so they could be used for DISPLAY purposes, or as MUSEUM examples.
If the heater is connected to a 12-13V power supply, it illuminates like an incadescent bulb 20-25W. Non-standard use might be as a night lamp.

Cathode type : tugsten,carbidized,direct heating
Application field : power amplification up to 50 MHz
Brief application : power amplification, oscillation
Envelope : glass
Cooling method : air
Dimensions (DxH) : 120x240mm
Mass : 0.8 kg
Filament voltage : 12.6 V
Max Filament current : 11 A
Maximum Anode voltage : 3000 V (3 kV)
Maximum Output power : 750 W (0.75 kW)
Maximum operating frequency : 50MHz
Ambient temperature : -10...+55 degr. Celsius
Max Envelope Temperature : +350 degr. Celsius
Base: special type, 6 pin, with Anode and G3 located on top.

Datasheets in Russian and in English are shown on the photos. I noticed a few small differences in these two datasheets (like the size, incorrect Diameter in English datasheet, and the max power output), I would prefer to trust a bit more on the one written in Russian language. I've written in this listing only the correct figures, according to my personal measurements.

Condition: USED. Each filament (heater) was tested with ohmmeter and under nominal voltage.
I don't have a way to test how the tubes perform in real working conditions. That's why tubes for sale here are SOLD AS-IS.

QTY = 2 pcs (The price is for 2 tubes)

Economy shipment for Europe (no tracking): $15.00
Standard shipment for Europe (with tracking): $21.00
Economy shipment Worldwide (no tracking): $18.00
Standard shipment Worldwide (with tracking): $25.00
I recommend using tracking number because the postal service with tracking is SAFER and FASTER.

 

SHIPMENT

All item(s) will be shipped by registered priority airmail, unless other agreement is set with the buyer.
DHL, FedEx or UPS shipment may be arranged too. In this case I would prefer if you have a customer number in the particular courier service.
Typical delivery times for registered airmail are:
EUROPE (All countries): 8...14 days
ALL OTHER destinations (North and South America, Asia, Africa, etc.): 12...20 days
EXCEPTIONS:
1. ITALIAN customers, please be more patient. For unknown reasons deliveries to Italy usually take longer than to the rest of Europe, i.e. 12...16 days.
2. Good news for AUSTRALIAN customers, usually shipment to Australia is pretty fast, it takes no more than 8...12 days.
If a buyer purchases several items I will combine the shipment to reduce shipment costs. In this case please wait to receive the final invoice with the combined shipment cost

PAYMENT

In the past I used to accept a great variety of payment options but from the end of 2008 eBay does not permit any other payment options except the following two companies, which they own: Paypal and Propay.
Currently I can accept only Paypal from these two.
Whatever payment option you choose, please, don't forget to write the eBay item number(s) you are paying for.

Here are all the payment options I accept, explained in detail, in the order I prefer them:

1. Moneybookers. www.moneybookers.com

2. Paypal. www.paypal.com

3. Other. I may accept other options permitted by ebay. Please contact me if you want to pay with any other payment options.