SE Output transformer x2 Tube Valve Röhrenverstärker 845 211 RS291 Vintage Cores

Description

You are bidding for pair SE output transformers for Hi-End quality amplifier.
Branded amplifier with similar transformers on board will cost thousands & thousands $ on the market.
Transformers are hand winded with precision accuracy made by DIY enthusiast for others, ho would like to build your own project. It is result years of experiments, searches, conversations, music listening and hard job. These transformers are much larger than most of similar items available on the market nowadays. Size is important factor, if you would like hearing low non-distortional bass from your tube amp. These are capable transfer power more close to low end of musical diapason.
Transformers made with using vintage cores fabricated at 50
th
previous century.
Secondary windings made in accordance with vintage patented technology and allow you connect different speakers without loosing transformer bandwidth.
Technical details:
Transformer core size - equivalent of EI 140;
S = 30 cm^2;
Ra = 11k / 8 or 16 ohm,
Potential tube plate current nominal 80mA with a max up to 120mA;
Power = 25W (20 Hz) with magnetic flux 0,5T;
L = 55H (Tube RLC meter А4-М2 (4V 50Hz)) 70H max;
R1 = 214 Ohm;
Bandwidth = 14Hz (-2db ) - 23kHz (-3db) with grounded secondary winding, 38kHz (-3db) without grounding;
Performance = 95%;
Damping coefficient with 845 tube = 4,3;
Weight 9 kg = 1pc;
Size = 110 * 140 * 110 mm installed on chassis (
110 * 140 * 150 mm - full dimensions);
Insulation test – 2,5kV;
Example of tubes to use: 211, 845, DA60, DA100, RV258, RV239, RS282, RS291, GM70 & e.t.c.
Shipping within Europe by Courier Companies. Same shipping cost for any destination.
Worldwide shipping possible, but very expensive due high weight. Quite seller for cost.
I can accept transformers return within two weeks, if you will not satisfy with these and will cover postage cost for both ways. Really, I’m pretty sure this will not happen.
Private selling.  Payment should be done within 3 days. Bid accordingly with posted above.
Contact seller in case of additional questions
. Check my other tube auctions.
Don't loose opportunity.
Happy bidding.