{"id":1416,"date":"2020-04-08T20:26:21","date_gmt":"2020-04-08T19:26:21","guid":{"rendered":"http:\/\/www.wiredwood.co.uk\/wordpress\/?p=1416"},"modified":"2020-04-08T20:26:21","modified_gmt":"2020-04-08T19:26:21","slug":"stereo-phono-vorverstarker-pre-amplifier-pa-005","status":"publish","type":"post","link":"http:\/\/www.wiredwood.co.uk\/wordpress\/stereo-phono-vorverstarker-pre-amplifier-pa-005\/","title":{"rendered":"Stereo phono vorverstarker pre-amplifier PA-005"},"content":{"rendered":"

You don’t say!<\/p>\n

\"hama
hama phono amplifier<\/figcaption><\/figure>\n

That’s what it says on the tin. But what’s inside?<\/p>\n

I use this phono amplifier mainly for temporary lash up’s when I’m testing a turntable which I have been working on. It’s battery powered, so not ideal for permanent setups. It came in a bundle of electronics bits as part of a car boot purchase.<\/p>\n

It recently started cutting out on me. Fiddling with the on off switch brought it back to life sometimes<\/p>\n

\"hama
hama phono amplifier inside<\/figcaption><\/figure>\n

It just pivots open to give access to the battery. I poked about a bit with a screwdriver around the switch with some success. Probably just a dry solder joint or mucky switch contacts, so I’ll tackle both.<\/p>\n

\"phono
phono amplifier circuit layout<\/figcaption><\/figure>\n

Just 6 bolts liberated the circuit from it’s case. The problem was as expected. A minute with a soldering iron and a squirt of switch cleaning\u00a0 spray quickly fixed the problem.<\/p>\n

\"phono
phono amplifier transistors<\/figcaption><\/figure>\n

Looking at the component side of the board I can see it is a basic design. Nothing wrong with that. Just two npn transistors per channel.<\/p>\n

\"phono
phono amplifier components<\/figcaption><\/figure>\n

So an easy fix got me back up and running. A cheap amp like this is no competition for a modern phono amp, or a decent vintage one like that inside my\u00a0 Cyrus One. However, it will do the trick to connect a turntable to a modern amp to Get you started<\/p>\n","protected":false},"excerpt":{"rendered":"

You don’t say! That’s what it says on the tin. But what’s inside?<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,30,11,17],"tags":[],"class_list":["post-1416","post","type-post","status-publish","format-standard","hentry","category-amplifier","category-ancillary","category-repair","category-turntable"],"_links":{"self":[{"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/posts\/1416","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/comments?post=1416"}],"version-history":[{"count":3,"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/posts\/1416\/revisions"}],"predecessor-version":[{"id":1419,"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/posts\/1416\/revisions\/1419"}],"wp:attachment":[{"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/media?parent=1416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/categories?post=1416"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.wiredwood.co.uk\/wordpress\/wp-json\/wp\/v2\/tags?post=1416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}