{"id":45,"date":"2007-02-20T00:29:48","date_gmt":"2007-02-19T23:29:48","guid":{"rendered":"http:\/\/stuphi.co.uk\/wordpress\/?page_id=45"},"modified":"2007-02-20T00:33:53","modified_gmt":"2007-02-19T23:33:53","slug":"tube-amp-first-power-up","status":"publish","type":"page","link":"https:\/\/stuphi.co.uk\/wordpress\/?page_id=45","title":{"rendered":"Tube amp first power up"},"content":{"rendered":"<p>I found a list for the steps to take when powering up a new tube amp for the first time at <a href=\"http:\/\/18watt.com\">18watt.com<\/a>. The origional post is <a href=\"http:\/\/18watt.com\/modules.php?name=Forums&#038;file=viewtopic&#038;p=123967#123967\">here<\/a>.<\/p>\n<p>Before the first power up<br \/>\n# Trace entire circuit with hilighter<br \/>\n# Measure all resistor values<br \/>\n# Test all ground connections to each other<br \/>\n# Check all tube connections for poor solder joints<br \/>\n# Cont test adjacent pins on tube sockets<br \/>\n# Check all OT wire colours &#038; connections<br \/>\n# Check all PT wire colours and connections (measure winding values)<br \/>\n# Check all ground connections (from the leads)<\/p>\n<p>First Power Up<br \/>\n# tubes out<br \/>\n# output with dummy load<br \/>\n# on standby<br \/>\n# use variac slowly to bring filter caps up (for SS power supply)<br \/>\n# power on<br \/>\n# check voltages to transformer, heaters<br \/>\n# check voltages on rectifier tube &#8211; compare against schematic<\/p>\n<p>Second Power Up<br \/>\n# rectifier tubes in<br \/>\n# other tubes out<br \/>\n# output with dummy load<br \/>\n# use variac slowly to bring filter caps up (for tube power supply)<br \/>\n# power on<br \/>\n# off standby<br \/>\n# check B+ voltages<br \/>\n# compare to schematic<\/p>\n<p>Third Power Up<br \/>\n# all tubes in<br \/>\n# output with dummy load<br \/>\n# power on<br \/>\n# off standby<br \/>\n# check tube voltages &#8211; compare to norms.<br \/>\n# Also check line voltage.<\/p>\n<p>Sound Test<br \/>\n# test with signal generator or guitar<br \/>\n# Exercise all knobs<br \/>\n# Exercise all jacks<\/p>\n<p>Pre Burn-in Adjustment<br \/>\n# Adjust Bias on pre-amp tubes<br \/>\n# Adjust Bias on power tubes<br \/>\n# Calculate power tube plate dissapation<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I found a list for the steps to take when powering up a new tube amp for the first time at 18watt.com. The origional post is here. Before the first power up # Trace entire circuit with hilighter # Measure &hellip; <a href=\"https:\/\/stuphi.co.uk\/wordpress\/?page_id=45\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":18,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/stuphi.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/pages\/45"}],"collection":[{"href":"https:\/\/stuphi.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/stuphi.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/stuphi.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stuphi.co.uk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=45"}],"version-history":[{"count":0,"href":"https:\/\/stuphi.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/pages\/45\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/stuphi.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/pages\/18"}],"wp:attachment":[{"href":"https:\/\/stuphi.co.uk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=45"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}