The McIntosh MR71 vacuum tube FM stereo tuner was in production from 1963 to 1969 and retailed for US$399. (Today a good MR71 can still command a price 5 times that!)
The MR71 was the last tube tuner made by McIntosh and, together with the earlier MR67 model, is regarded as the best tube tuner that McIntosh made.
This Japanese single-ended, vacuum tube amplifier can be purchased in ‘kit’ form or fully assembled.
Power output is 3.5 watts/channel. Supplied with Russian Sovtek tubes – 2A3 (2), 6SN7 (2), 5U4G (1). Amplifier weight is 16 kgs.
Input Sensitivity is high (150mV), so with the in-built volume controls, this amplifier will accept Line level sources easily.
When I first listened to DACs, I concluded quite quickly that ‘multi-bit’ DACs sounded more like music to me, than ‘bitstream’ DACs – more dynamic & ‘alive’.
The TDA1541 was originally developed by Philips (in 1985) as a high performance stereo DAC. The ‘A’ version was manufactured between 1989-1995. It was (is still?) regarded as one of the best sounding DACs ever made. This chip was used in almost 100 different CD players
This is our finalised DIY cleaner ‘kitset’ design.
It is a 3-piece ‘kitset’ designed for easy self-assembly, with only 4 screws.
An additional 3 screws attach a slow-rotating BBQ ‘rotisserie’ motor and the whole assembly fits neatly onto the top of a 6 Litre Ultrasonic Cleaner tank.
We all know that the small things matter in hi-fi. Especially at the front end of the audio system – eg. the pickup cartridge and tonearm.
Trans-Fi Terminator tonearm is constructed with a 6mm aluminium ‘L’ Mounting Plate. It’s machined shape and necessary slotted holes, no doubt reduce its structural and torsional rigidity.
Would there be energy loss?
I have to say that I’m a little bit excited about this right now…..
Over the past week, I have been testing vinyl records in an Ultrasonic cleaning machine and the results have been all positive.
In the past, I have used a Nitty Gritty record cleaning machine (RCM) and in recent years have acquired an old but well-respected Keith Monks RCM (below).
Pt I, next, the Amplifier boards are removed for modifications:
Reduce input gain by 50-60%, to suit higher output from modern digital sources (Roe MK2 and Takman REY metal film resistors, change values to increase feedback, output stage).
Replace electrolytic capacitors (Elna Silmic II).
Renew transistors (3 per channel, BC550).