Spectrum 10mm transformers including replacements for some popular TOKO coils.  These transformers unlike TOKO are a series, 0.6, 1.2, 2.6, 5.3, 11, 23, 45, & 90uH.  Several are available in two versions, one with primary winding tapped a quarter total turns and secondary with low impedance winding and are designated with an L. 

The L version is ideal to use as an aerial input coil or the coil in a Hartley oscillator.

The other types are with centre tapped primary and medium impedance secondary and are designated by an H.

Type 5u3HH is better quality and higher stability.  The previous 5u3H has now all been sold.

The 5u3HH coil is a direct replacement for the TOKO type 3334 or 3337 and has minimum inductance of 3.0uH and maximum 7.5uH, it has 10t pins 1-2, 10t pins 2-3, so has 20t pins 1-3, and 4t secondary. The Q is 85 at 7MHz.  

For those not adept at calculating resonating capacitance, this coil will resonate with 27pF on 14MHz, with 47pF on 10MHz, with 100pF on 7MHz, and 330pF on 3.8MHz.

The International Tracked Carriage is quite high but it ensures safe and fast delivery.  You can buy up to 10 packs of 5 Spectrum coils from any of the range 1u2H, 2u6L, 2u6H, 5u3HH, 11uL, 23uL, 45uL, 90uL, 105uL and the carriage can be discounted to the same cost as one pack of 5 on request for invoice.  This can only be done using a computer as it doesn't seem possible using a mobile phone.