Tube Converter : 10 Steps (with Pictures) - Instructables
A study for the Implementation of Super Triode Connection (STC) Amplifiers
6GH8A National Pentode Triode Vintage Miniature Vacuum Tube 9-Pin NOS New Old Stock in Box
EI ECF802 / 6JW8 NOS - Substitute per 7199. Laboratorio Musicale
electron Tube Data sheets - 6
6AU8A / 6GH8A / 6BH8A USA 8 pieces NOS valve tube | eBay
RCA USN CRC 5963 Vacuum Tube New Old Stock Original Box - Etsy UK
6GH8A, Tube 6GH8A; Röhre 6GH8A ID4874, Triode-Pentode | Radiomuseum.org
6U8A JAN Philips / 7199 Substitute | TubeDepot.com
6GH8A Triode+Pentode, NOS
NOS RCA 6GH8A 6EA8 6U8A AMPLITREX MATCH PAIR for McIntosh Scott Dynaco Sherwood :: - 비드바이코리아 - 해외 전문 경매대행 선두주자 - BIDBUY
Download - Vacuum-Tube-Shop
6GH8A | TubeDepot.com
SM5CBW - Tubedata
6DT6 | RCA | PENTODE TUBE At 1.85 € HT on Electols
6U8A/6KD8/6AX8 SYLVANIA Sharp-Cutoff Pentode Medium-Mu Triode Vintage Miniature Vacuum Tube 9-Pin NOS New Old Stock in Box
6GH8, Tube 6GH8; Röhre 6GH8 ID4873, Triode-Pentode | Radiomuseum.org
Preamp Tubes
6GH8A @ The Valve Museum
Pentode/triode tubes
Tube Converter : 10 Steps (with Pictures) - Instructables
NOS+EI+PHILIPS+6GH8A+6EA8+PLATINUM+AMPLITREX+MATCHED+PAIR+for+Dyn+ST-70+Mod+100 for sale online | eBay
Which can be a substitute for the 7199 (only) pentode ?
6GH8 - Wikipedia
6GH8A, Tube 6GH8A; Röhre 6GH8A ID4874, Triode-Pentode | Radiomuseum.org
