Icon Audio LA5 TX Valve Pre Amplifier
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  • Regular price £2,999.00
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A very special transformer based pre-amplifier

Transformers sound best!

Well made audio transformers can provide perfect coupling in a hi fi system. Free from the “mechanical” sound of solid state and the deficiencies of output capacitors, they can make reproduction more vibrant and focussed.

The heart of the LA5tx are two very special line level output transformers, developed “in house” over several years to give what we think is the best sound balance.

Something for nothing?

This can be done with a “passive” transformer, but the results will vary depending upon the source impedance of the previous stage. If it is not “strong” enough poor matching will be obtained. In electronics you cannot get something for nothing! The LA5tx single 6SN7 valve “buffers” the input source, this way the LA5tx always presents a constant high impedance load, so the “strength” of the previous stage is irrelevant. The “strong” output of the 6SN7 then drives our transformer to give either a perfect “balanced” output as well as a phono RCA.

The very low 250Ω output impedance of the LA5tx is then strong enough to drive virtually any length or type of interconnect cable without loss or damage to the precious signal.

So we feel that this is a better solution than just using a transformer alone.

A high end pre amplifier must have the best power supply. The LA5tx has two chokes in double Pi configuration for well conditioned power giving superb smoothing for velvety inky black silence. The GZ34 rectifier valve has a more fluid sound than silicon diodes making a surprising difference.

The LA5tx is designed for the very best transistor and valve power amplifiers where musical purity is required rather than starkness.

The audio valve we use is the 6SN7 double triode. This 1940 vintage valve has all the best characteristics for the job, and its larger size means long life and good stability. Also the sound is more musical as we feel these have a more fluid sound. You can experiment with both vintage and modern types.

• • Icon Audio custom output transformers
• All hand wired point to point
• ALPs Blue motorised volume pot.
• Stepped attenuator option
• All Triode simple design
• 2x 6SN7 valves
• GZ34 Valve rectifier (also 274B/5AR4)
• Double Choke HT supply
• DC heater supply
• Signal to noise level -90db#
• Freq response 20Hz-15kHz +0 -0.5db
• Freq response 13Hz-20kHz +0 -1db
• Freq response 7Hz-28kHz +0 -3db
• THD typically less than 0.18% (0.5v output)
• Gain 3x, 7db
• Max output level 20v for 6.66v input
• Low output impedance of 250Ω
• Suitable for power amps 100mv-2v sensitivity
• High quality 2w metal film, & wire-wound resistors
• Solen/SCR audio capacitors (Jensen option)
• Silver PTFE audio cable
• Gold plated Input terminals
• Four line inputs
• Record loop
• 220/240volts 75watts
• Comprehensive manual supplied
• C E compliant
• 34.5cmW, 32D, 19.5H (with 274B), or 17H with GZ34 18kg with packing
(Specifications subject to change)

Various valve and capacitor upgrades are available, contact us for more information.


A simple low gain pre-amplifier that buffers the input and provides the transformer with optimum drive to achieve the full potential from our unique output transformers.


(Specifications subject to change, errors & omissions excepted. General July 2018)

We are still delivering orders as normal. When your order ships you will still receive tracking details. For UK shipments, Our couriers have procedures in place to ensure deliveries are arriving as quickly & safely as possible. Drivers can now sign for your parcels, however will notify you that they have arrived, in order to ensure you receive your parcel. Signing for the parcel has now been stopped temporally for hygiene reasons. Drivers are also working with customer instructions, so you can ask them to leave the parcel in a safe place (doorstep etc...) if you prefer not to come into direct contact with the driver.

There has been no changes to deliveries with Brexit. All deliveries to the UK mainland, Northern Ireland and the Republic of Ireland are operating as normal. No VAT or charges are applicable. 

Express Deliveries

Express Delivery is FREE on all orders over £50. Express Delivery offers delivery in 24-72 hours from time of purchase. We use premium couriers for this service, mainly DPD & Royal Mail. DPD will offer you a one hour window for delivery to make sure someone is at home, or you can reschedule the delivery if no one is around. 

Standard Deliveries

Here at Kronos AV, we have vast experience with e-commerce sales. Making sure that your parcel arrives undamaged is a huge priority for us. That’s why at Kronos AV, we only use premium couriers for all our orders. All our parcels are shipped with DPD or Royal Mail and are always sent Signed For to make sure it gets to the right person. 

If for any reason your parcel does arrived damaged, please get in touch, and we will be happy to get everything resolved for you. We are always on hand to help!


Delivery is FREE on all orders over £50. In order to offer FREE delivery to UK customers, we use several premium couriers to ensure your delivery arrives safe.

Most large orders (over 2kg) ship using DPD or DHL courier and smaller orders (under 2kg) by Royal Mail signed for services.

The most appropriate courier will be chosen for the items ordered to ensure the quickest possible delivery.

We can offer very generous trade in offers across the majority of our product range. 

Why not ask and see how much you HiFi is worth!

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If you have any question, please feel free to call us on 03435236169 or email support@kronosav.com