https://www.tubedepot.com/

https://www.parts-express.com/

http://www.fenderguru.com

http://www.ampwares.com

http://www.tdpri.com

http://www.triodeelectronics.com/

https://www.hammfg.com/electronics/transformers/classic

http://www.amprepairparts.com

http://mercurymagnetics.com/pages/mainframe.htm

http://thevintagesound.com/store/

https://www.amplifiedparts.com/products/amplifier_parts_0

https://www.audioasylum.com/

https://tubeamplifierparts.com/

http://www.aikenamps.com/

http://www.duncanamps.com/

http://bustedgear.com/

http://www.londonpower.com/

http://tweakheadz.com/

https://www.modkitsdiy.com/

http://www.mojotone.com/

http://guitarkitbuilder.com/

https://reverb.com/

https://www.gearslutz.com/

https://shop.fender.com/en-US/parts/

https://www.allparts.com/

https://peavey.com/

https://www.simplyspeakers.com/

http://www.guitar-parts.com/

http://www.generalguitargadgets.com/

https://www.seymourduncan.com/

http://www.dimarzio.com/support/wiring-diagrams

http://www.rickenbacker.com/service_g_schematics.asp