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Bottlehead Crack Headphone Amp - Build and Modification

This blog post was sent in by a loyal customer, R.T. reviewing the Bottlehead Crack Headphone Amplifier kit and detailing some of his very own tweaks. In outline, US-based Bottlehead has been creating valve kits for some time and have a good following. This kit is their all new output transformerless valve headphone amplifier featuring the double triode 6080 valve. This kit suits high...

Kaisei First Impressions

This weeks blog comes from F.C. in regards to some recently purchased capacitors:


"I received today, among other parts, three Kaisei 4700uF/25v. Two for one of my gainclones and one for an old dac psu, feeded by batteries. 

I must report that I am very happy with the sound.
I allways used Silmic or Mundorf, where caps have an important influence...
Powertron Resistor Review

This weeks blog is an extremely detailed and well thought out review by one of our valued customers, Mr M.R. Is his own words:


"Powertron metal foil resistors “... are used throughout the industry ... and offer an incredibly stable resistance up to around 65 degrees ....”. Both statements by the Hifi Collective team caught my attention and some...


Todays blog was sent in by P.E. from sunny Cali in the U.S.A. Heres the latest edition of his system recently updated with parts from HiFi Collective.





Hello hifiers!


This weeks blog comes from Keith Marshall, of Audio Wise.

Shown in these photos: 


The "Trio-P, a combined mm/mc phono pre-amp and passive controller, built with selector and attenuation switches, wiring and resistors of the very...

This week we have a write up from A.C. about upgrading cables with cotton sleeving:
"I made a pair of silver foil speaker cables using your cotton sleeving, and the sound is astonishing! I expected an improvement in the treble and detail compared to the old copper foil cables but I was pleasantly surprised by the transformational change...


Here we have another detailed write up from R.T. about the Elekit TU8600 kit. In his own words:


"Before I write a few words regarding my TU8600 build I must first say a massive thank you to Victor Kung @ vkmusic.ca. Victors passion, knowledge and commitment to making my purchase of this kit as straight forward and as pleasant an experience as he possibly could went way...

Part 2 of Gábor Horváths upgrade story comes today with the tube line preamp he's worked on. In G.H.s own words:
"I found a nice tube line preamp designed by Giorgio Pozzoli.
It uses 2 pcs E88CC (6922), 1 per channel. Volume potentiometer is situated at the output instead of the input. I like this because the signal to noise ratio...

The next few blog posts come from Hungary, sent in by Gábor Horváth.

Watch this space as over the next few weeks we'll be showing a few more of G.H.'s projects, starting with his speaker upgrades. In his own words:

"It is DF3-160 kit with D21, D54 and 30W54 speakers.
I applied the original Heybrook HB3 stand to raise the loudspeaker to the proper position.


Following our visit to the Warsaw 2018 Audio Video Show, we came across a demonstration room featuring Cube Audio Nenuphar Loudspeakers. My head was turned. I have never heard full range drivers sound so good. Being high efficiency they suited valve amplifiers.

So I set to work and after a lengthy conversation with Grzegorz Rulka we secured the distribution on not only their incredibly...

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