Skip to main content

Analogue Audio Engineering

Search This Blog

September 08, 2026

Get link
Facebook
X
Pinterest
Email
Other Apps

Picture of my Steinhard Audio Bolero after the 10-year first service on 11December 2025

Get link
Facebook
X
Pinterest
Email
Other Apps

Comments

Post a Comment

Popular Posts

Gunter Steinhart Bolero amplifiers - fully restored and upgraded. 300W Class A valve Mono block's I purchased the two vintage Gunter Steinhart Bolero mono blocks from a collector in Cape town during December 2015, they were electrically working but many years at the cost had takin it toll on the mechanical parts. These amplifiers were manufactured in the early 1990's in South Africa by Steinhart Audio, they are equipped with eight Sovtek 6Pi45C valves each and are rated at 300W / 8 ohm. What's in the name? At the time we planed the job I wanted to distinguish the rebuilt units from the original so I added an R (for refurbished) into the brass nameplate, this spelled BORLERO instead of BOLERO (it seemed like a good idea at the time), in the future units we will change this to BOLERO R as it falls easier on the eye and does not look like a type-o. The two mono block's were electrically tested in my workshop ...

Gunter Steinhart Bolero R and DVP 2XR RS for Donald. We will be rebuilding a pair of amplifiers and a preamplifier for Donald. The Bolero's will be getting a full refurbishment and chrome as in the rebuild of my amplifiers (posted on this blog 23.05.2016), Donald also wants a preamplifier that will match his new Boleros, he selected a Gunter Steinhart DVP 2XR from his collection for this and asked me to restyle and refurbish it. The preamp is a first for me as I always rebuild equipment to the original factory specification, the most I modify to a unit is the paint color or changing from paint to chrome or perhaps a new face or name plate but it is always in-line with the original equipment look and specification. Over the years I have designed and styled many new equipment, I have never been asked to re-style and repackage vintage equipment, but it was a challenge so I accepted. During the past week me an...

Solving the TO3 direct replacement and obsolescence problem Over the past years I have been faced with a continual problem during repair and refurbishment of older Transistor and FET based power amplifiers and power supplies, so much so that in many cases really rare equipment sometimes does not get repaired and we think twice before taking them on for full refurbishment. This is due to the obsolete nature of the TO3 and its derivative (TO204AA) Transistor, FET and Regulator packages. Over the past year we have developed a TO3 carrier that will carry a standard D-Pack device and mimic exactly the foot print and mechanical considerations of the TO3, we have found that there are many equivalents to the old TO3 devices available in D-Pack. One good example is IRF244 which can be replaced with a IPB600N25 3G OptiMOS at a cost of US$1.32 (ZAR18.02) and about US$10.00 (ZAR135.00) for the carrier and assembly. How it works: We machine a TO3 body from brass flat-bar, Ni...

Powered by Blogger