Category Archives: Preamplifiers

The preamplifiers category houses all articles relating to the service, repair, restoration and review of hi-fi preamplifiers.

Krell PAM-7 Class-A Preamplifier Repair & Overhaul

Krell has produced some stunning gear over the years and this Krell PAM-7 is a beautiful example. Come with me as I repair and overhaul this lovely old girl.

The Krell PAM-7 preamplifier dates back to earliest days of Krell, but all the trademark features are present: thick boards, premium parts, class-A operation, separate power supply and the unique styling the company used back in the day.… Read more

Accuphase C-202 Line-Level Preamplifier Service & Review

The Accuphase C-202 line-level class-A preamplifier is an extraordinary piece of hi-fi gear. Come along as I service and review this great preamp.

The Accuphase C-202 is a line-level, class-A, fully balanced preamplifier. It also features a dedicated CD buffer circuit, with very little in the signal path. By any measure, it is a superb piece of gear.… Read more

Krell KRC-HR Ultimate Preamplifier Restoration & Repair

Welcome back audio friends. Come with me this time, as I dive deeply into the repair and complete restoration of one of the best solid state preamplifiers of all time – the magnificent Krell KRC-HR.

NOTE – for a bunch of different shots and angles, check  out my detailed Krell KRC-HR video overview!

If you’re reading this, you’ve probably heard of Krell and know something about the incredible range of premium, industrially constructed gear they made throughout the 1980’s and 1990’s.… Read more

Yamaha CX-1 Preamplifier Service & Repair

You may have seen the article I wrote recently about repairing a gorgeous Yamaha MX-1 power amplifier. This time I’m servicing a Yamaha CX-1 preamplifier, which matches the MX-1 and is part of the same set.

Yamaha made some really superb hi-fi gear back in the day, as I’m sure many of you know. There were the B series VFET amps like the B-1 and B-2, the legendary NS-1000 monitor loudspeakers, the perhaps even more (studio) famous NS-10 monitors, awesome MX-10000, CX-10000, and many more.… Read more

Shocking Latest Krell & H/K Hall of Shame Additions

These latest additions to the Hall of Shame are two of the worst cases of hi-fi electronics bodgery I’ve ever seen. The destruction of this Krell KRC preamp by a so-called expert must be seen to be believed.

What follows are snippits from my latest Hall of Shame cases. Visit my Hall of Shame for all the horrifying details, more photos and more detailed descriptions, plus even more cases.… Read more

McIntosh C220 Preamplifier Repair

I’ve just repaired this lovely McIntosh Laboratories C220 preamplifier. This seemingly high-quality preamp fell victim to a growing problem with newer gear – modern Pb-free production processes.

The McIntosh C220 preamplifier is a hybrid tube/transistor based preamplifier, featuring a phono preamp and microprocessor control. It’s a well-made unit, though not like the McIntosh of old. The board is high-quality fibreglass and internal layout is clean and tidy, using nice parts.… Read more

Quad 44 Preamplifier Service

I’ve just serviced a Quad 44 preamplifier. In this article, I’ll show you what the 44 looks like inside and explain some of its features.

Along with a Quad 405 power amplifier, I recently serviced this Quad 44 preamplifier, both owned by the same customer. I’m told he purchased them after a chat we had about resurrecting his KEF speakers, and purchasing some Quad gear to power them!… Read more