I would like to offer OLD NOS GU-48 tubes. They are mentioned in this my thread
https://www.diyaudio.com/forums/tubes-valves/365401-tube-amplifiers-pmc-eb1i-speakers.html
Before this 833A project, I have collected a lot of GU-48 tubes from russian traders. They there all in sealed original boxes. During the 833A project, I assembled a high voltage test unit, and heated up all the tubes with applying 1700-1900V voltages to plates. All tubes were stable in plate current after few minutes of heating, that is absolutely wonderful result for big tubes produced in 1972-1974 year. They are very good and reliable stuff, and I could select even "matched" pairs and quards, based on the one-parameter testing results.
I could sell up to 20pcs of these tubes, packed as pairs or as quards, with good packing quality. I want 125usd/pcs, plus shipment.
https://www.diyaudio.com/forums/tubes-valves/365401-tube-amplifiers-pmc-eb1i-speakers.html
Before this 833A project, I have collected a lot of GU-48 tubes from russian traders. They there all in sealed original boxes. During the 833A project, I assembled a high voltage test unit, and heated up all the tubes with applying 1700-1900V voltages to plates. All tubes were stable in plate current after few minutes of heating, that is absolutely wonderful result for big tubes produced in 1972-1974 year. They are very good and reliable stuff, and I could select even "matched" pairs and quards, based on the one-parameter testing results.
I could sell up to 20pcs of these tubes, packed as pairs or as quards, with good packing quality. I want 125usd/pcs, plus shipment.
Attachments
Hello, excuse me for late reply, maybe I have not been informed via email about your post.
I have checked cost of air shipment to UK by ordinary Uzbek Post (tracking is provided). For parcels up to 1kg it is 34usd, every additional 1kg is 11usd.
I suppose two GU-48 with good packing will fit in 3kg total parcel weight.
So 125 + 125 + 34 + 11 + 11 = 306 usd is total cost of a pair of GU-48 shipped to UK.
Here are photos of a good quad. Same year 1972, same month II. Measured plate-cathode voltages needed to achieve 135mA plate current at auto bias connection (cathod resistor (15 || 15) + 200 Ohms) are:
tube No18 = 1699V
tube No29 = 1704V
tube No43 = 1707V
tube No32 = 1711V
tube No18 = 1699V
tube No29 = 1704V
tube No43 = 1707V
tube No32 = 1711V
Attachments
Yes, another two or four pcs of GU-48 are available, with the following measurements (plate-cathode voltages needed to achieve 135mA plate current at auto bias connection (cathod resistor (15 || 15) + 200 Ohms):
tube No39 = 1740V
tube No41 = 1748V
tube No20 = 1750V
tube No34 = 1753V
tube No39 = 1740V
tube No41 = 1748V
tube No20 = 1750V
tube No34 = 1753V
I did shipment of 4 tubes to Europe, weight of the parcel with that good packing was 4,4kg. I have calculated at International Uzbek Post site, air shipment to USA of such parcel comes to 100USD. Total cost of 4 tubes with shipment to USA will be 600USD. Tracking is available. If it is acceptable, I shall need your post address and phone number for shipment.
For payment, one could use Western Union or MoneyGram services. My data are
Mr. Vladimir Konoplev
Buyuk Ipak Yuli str., no 73, ap.4
100077 Tashkent, Uzbekistan
phone mob +998 97 750 12 78
For payment, one could use Western Union or MoneyGram services. My data are
Mr. Vladimir Konoplev
Buyuk Ipak Yuli str., no 73, ap.4
100077 Tashkent, Uzbekistan
phone mob +998 97 750 12 78
Vladimir, the dollar amount is agreeable, however, sending "cash" isn't. Perhaps PayPal or a credit card? Let's work this out, please email me: toolshedamps@gmail.com Thanks! Matt.
Thanks Vladimir! Can't wait to get them! If you know where to source "proper" tube sockets for them I would be very appreciative. Thanks! Matt.
I used GU48 (833) sockets from China, they are quite workable. Genuine soviet sockets do exist, but I have only 1 pcs.
Hello, NottY.
Yes, one matched pair is available, measured voltages are 1761V and 1765V (terms of measurements are described above in this thread). Cost of Shipment to Thailand (parcel up to 3kg) is 35usd. Shipment is by air with tracking possibility. Regards, Vladimir
Unfortunately PayPal does not work in my country still. I've sent a privite message to you for some details.
Do you have a matched pair available? Shipping would be to Canada. I PayPal still banned in Uzbekistan?