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Glasshouse Ladder stepped, mono Charcroft / Seiden

Here at Hificollective we always welcome requests for products that are not standard. So following on from the stereo Glasshouse Seiden / Charcroft ladder stepped attenuator over 3 years we were recently asked to build up a pair of 100K mono versions.

No problem - let's warm up the soldering iron!

To those of you unfamiliar with stepped attenuators, they are generally used to...



Over a year ago, we had a client ask for some advice on their ‘replacement parts’ proposals for an Audio Research Reference 1 pre-amp. Six months since the last parts were ordered, here’s P.B. talking us through what he’s changed and the result!


"Power Supply Stage:


1)  2 x sets of ‘industry-standard’ diodes replaced with 8 x UF4006 ultrafast...

ABS Expandable Sleeving Cable Comparison


Hey everyone,

We recently got in some ABS Expandable Sleeving that can be used to wrap the outside of your cables to help with ground and electrical interference problems. This can be especially useful for longer cable lengths, or for audio cables that are running in close proximity to power cables/sources. Use...

6L6 Valve/Tube Comparison


Hi Guys

How valves sound is a question we are often asked here at HFC. We thought we would start the ball rolling with the 6L6s tube comparison session. Let me introduce our new recruit - Elliot Leech. Recently graduated from the Liverpool Institute of Performing Arts, Elliot is a talented individual, having already worked as a producer/session player/audio engineer with...

Meridian 201 upgraded with Charcroft Z-foil resistors and Audio Note Kaisei caps.

Recently replaced components in the output stage of a modified Meridian 201 preamplifier have been given time to “bed in”, although from the onset it was clear that there was a noticeable improvement in sound quality. The resistors replaced Vishay bulk foils and the capacitors replaced Rubycons.

Examples of tracks which were used at random for listening tests, as I know them all well;...

Neotech NES-3003 MKII

Everyone is familiar with screened interconnect cables;

The screen is soldered to the earth at the source end (pre-amp), and attached to the earth of the plug, with the signal wire soldered to the signal pin. At the target end (power-amp) the screen is cut short (and either soldered over or use heat-shrink to make sure there are no stray wires) and the signal soldered to the signal pin...

How to measure C-Coils - Set-up

This is a brief guide on measuing C-Coils from Jantzen, as they cannot be measured as simply as other inductor types. 

"As mentioned in our website, you cannot measure C-Coils, like you would measure normal induction coils.

First of all you need a professional LCR meter or CLIO, measuring at 1 volt 1 kHz.

Secondly you cannot measure the coil on its own, because even with a...

F&T Capacitors New Values

We have recently recieved a very large delivery of F&T capacitors to re-stock those ever-popular values. 

There are also 8 new values;

F&T Axial: 47uf, 100uf, 150uf, 220uf all rated at 250v and 220uf 500v

F&T LFA Radial: 100uf 350v, 100uf 500v and 150uf 160v

For more information on these products please click ...

Zigmahornets, Using Fostex FE103en and FT17H Drivers

I have recently made a pair of Zigmahornets for my study. I used a pair of FE103en full range drivers and later added a pair of FT17H super-tweeters. BSC and crossover circuits were constructed with components sourced from you. The cabinets are MDF and finished with chalk paint. They sound fantastic for the price. Imaging is spectacular and worthy of speakers costing many times more. They are...

Terminating Litz Cables using a solder bath

Here we have a pair of short, 1 metre, speaker cables featuring Audio Note`s new Isis LX 168 Reference Copper Litz cable terminated with Audio Note Silver Plated 4mm banana plugs. 

On the odd occasion we do get asked to make up special cables for customers, which we are happy to do. Now Audio Note cables are generally litz cables. Whereby every strand is polyurethane coated, the...

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