{"id":299,"date":"2023-07-19T04:56:44","date_gmt":"2023-07-19T04:56:44","guid":{"rendered":"https:\/\/www.firstwatt.com\/?post_type=product&p=299"},"modified":"2023-08-31T17:31:48","modified_gmt":"2023-08-31T17:31:48","slug":"f1","status":"publish","type":"product","link":"https:\/\/www.firstwatt.com\/product\/f1\/","title":{"rendered":"F1"},"content":{"rendered":"

The F1 is a 10 watt per channel stereo amplifier operating in balanced single-ended Class A without feedback. Each channel has only one gain stage and draws a constant 100 watts.<\/p>\n

It is a power trans-conductance amplifier (or power current source, if you like), replicating an input voltage into an output current. A regular amplifier sends output voltage to the loudspeaker. This is not that kind of amplifier.<\/p>\n

This amplifier ignores the elements in series with the load circuit, including back-emf, wire resistance, inductance and such, and creates voice coil acceleration in direct proportion to the input signal.<\/p>\n

It is well suited to sensitive full-range drivers such as Lowther or Fostex, and allows easy use of parallel loading networks to tailor the driver response.<\/p>\n

It has both balanced and single-ended inputs. The input impedance is nominally 80 Kohm, and the output impedance is 80 ohms. The output noise is around 100 picowatts (100 trillionths of a watt).<\/p>\n

The simplified schematic of the F1 looks like this:<\/p>\n

\"\"<\/p>\n

At this time, F1’s are only available used, but there are a very few copies of new F1’s which are updated using the new power Jfets as found in the J2 amplifier. See the F1J product page.<\/p>\n","protected":false},"excerpt":{"rendered":"

Download F1 Manual<\/a> and the F1 Service Manual<\/a><\/p>\n","protected":false},"featured_media":552,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[20],"product_tag":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.firstwatt.com\/wp-json\/wp\/v2\/product\/299"}],"collection":[{"href":"https:\/\/www.firstwatt.com\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.firstwatt.com\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.firstwatt.com\/wp-json\/wp\/v2\/comments?post=299"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.firstwatt.com\/wp-json\/wp\/v2\/media\/552"}],"wp:attachment":[{"href":"https:\/\/www.firstwatt.com\/wp-json\/wp\/v2\/media?parent=299"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.firstwatt.com\/wp-json\/wp\/v2\/product_cat?post=299"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.firstwatt.com\/wp-json\/wp\/v2\/product_tag?post=299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}