• Single ended or push pull class A
• Power up to 50 watts RMS
• Interstage
• Line matching
• Input transformers
• DC chokes
• Swinging chokes
• Anode load chokes
• Multiple winding for wide bandwith
• Multi wound HT & LT mains transformers
• Drop through construction
• Above chassis mounting
• Chrome & black shrouds available
• Go to our E bay shop TRANSVAAMP for 300B Output transformers
• Custom design service

Output Transformers.

The designs are specified according to their reflected primary impedance, maximum recommended dc standing current and maximum power. Frequency response is typically within 1dB from 20Hz to 40KHz and 4 and 8 ohm secondary taps are provided. The power rating of the OPT should be twice the maximum power output of the stage. Open frame, fully shrouded or drop through can be supplied as required. 

Standard Range 

single ended output transformers

These transformers all have multi wound primary sections for enhanced performance and bandwidth

Single ended output transformers

 All can have ultra linear taps at no extra cost, all can be supplied fully shrouded, open frame or drop through as required. Please enquire about any requirements not listed here. 

Transformer Size Chart

All dimensions are in mm

Push Pull Ouput Transformers

Push Pull Class A output transformers all feature double section bobbins for balanced primary windings and multi section primary & secondary windings for enhanced performance

Interstage Coupling Transformers

The 1:1 ratio transformers have a very wide, flat, frequency response and excellent sonic characteristics. The 1:1.5 designs are more compromised, but still extend beyond 40KHz. The initial designs have been based around using the following valve types for drivers: 5687, E182CC, 417A, parallel 6SN7, parallel ECC82. Designed around a 15mA-20mA primary current, approx. 3K5 anode impedance, or below. Other drivers such as 3A/167M and ML4 have been used successfully. They can be used with a large range of output valves, including 211, 845, 300B, 6080, 2A3 etc.

The 1:1 transformers offer the best high frequency extension and drive capabilities. The frequency response of the it102, for example, is 10Hz-120KHz at -3dB, there are no out of band resonance peaks or dips either which we believe is unique. They are sonically far and away the best method of coupling your driver to output, no cap is even close.The 1:1.5 are aimed primarily at high bias output valves to help reduce the voltage swing required from the driver valve e.g. 845, DA100, 6080 etc. They are capable of bandwidths over 40khZ incorrectly designed circuits

Mains Transformers 

Our mains transformers are all designed using the latest CAD technology to provide good regulation (usually <5%) and optimum performance together with cool running for increased service life.

All transformers are varnish impregnated using a UL approved clear Solventless varnish which not only seals the windings against moisture ingress but also gives extremely low audible noise.

Open frame, fully shrouded or drop through types are available as requested.

Pricing for mains transformers is based upon having 3 secondary windings and the VA rating of all the secondaries added together.

Power Supply Inductors 

Inductor smoothing is becoming popular factors, and better voltaagain as more people realise it was abandoned for reasons of cost, not quality. Inductors afford higher smoothing ge regulation, giving quieter operation and better dynamics. Using chokes enables lower values of smoothing capacitance to be used, allowing higher quality types to be specified.

The ch109 has been specially developed for use in high current, high voltage, choke input filter power supplies. Its primary use is for choke input supplies for stereo 300B amps where you may be looking at 450Vdc rails at up to 200mA. It is available only as an open frame construction, but has been built to be quieter than normal chokes in a similar supply.

We are the original supplier for transformers used by the following manufacturers

Arion Acoustics+Audio Innovations+Second Audio+World Audio Design