Keywords: AmpegV4 head.jpg Ampeg http //www ampegv4 com/ V4 head 1970-1980 <ref>https //store bluebookinc com/InstantAccess/Model aspx product 1 id 30 AMPEG ELECTRIC TUBE AMPS MISC 1970S MFG Blue Book of Guitar Amplifiers Online Subscription Blue Book Publications Inc </ref> en wikipedia 2006-06-22 Heteren wikipedia en References reflist Heteren original upload log page en wikipedia AmpegV4_head jpeg 2006-06-22 15 31 Heteren 640×272× 73155 bytes <nowiki> </nowiki> Ampeg 1970s instrument productions |