Kt66 tubes
Kt66 tubes for sale on Ireland's largest auction and classifieds sites
Gec kt66 vacuum tube valve - kt66, - £75.00
Gec kt66 vacuum • Tube valve tested • Strong audio vintage - Free postage - New and Used
Gec kt66 vacuum • Tube valve tested • Strong audio vintage - Free postage - New and Used
Boxed nos gec - kt66, valve - £170.00
Boxed nos gec • Kt66 valve date • Code 7220 week - Free postage - New and Used
Boxed nos gec • Kt66 valve date • Code 7220 week - Free postage - New and Used
Marconi kt66 grey glass black - marconi, - £49.00
Marconi kt66 tube • Working order but • Only fair output - Free postage - New and Used
Marconi kt66 tube • Working order but • Only fair output - Free postage - New and Used
Boxed nos gec - nos, valve - £150.00
Boxed nos gec • Kt66 valve date • Code may 1962 - Free postage - New and Used
Boxed nos gec • Kt66 valve date • Code may 1962 - Free postage - New and Used
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Gec kt66 electronic tube - kt66, - £75.00
Gec kt66 electronic • Tube vintage valve • Tested 5ma classic - Free postage - New and Used
Gec kt66 electronic • Tube vintage valve • Tested 5ma classic - Free postage - New and Used
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48 listings · from £6 · avg £193.12
⚠️ These listings were last updated more than 9 days ago.
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Browse 48 kt66 tubes listings currently in our index. Prices range from £6 to £1077.7, with an average of £193.12. Whether you are hunting for a bargain or looking for a top-spec model, the selection below covers all price points — new, used and refurbished. More about kt66 tubes →
Kt66 original marshall spares - marshall, - £120.00
Kt66 original marshall • Spares these are • Best value quality - Free postage - New and Used
Kt66 original marshall • Spares these are • Best value quality - Free postage - New and Used
Kt66 original marshall spares - original, - £60.00
Kt66 original marshall • Spares these are • Best value quality - Free postage - New and Used
Kt66 original marshall • Spares these are • Best value quality - Free postage - New and Used
Gec kt66 rare matched - matched, pair - £350.00
Have sale rare • Matched pair gec • Kt66 new original - Free postage - New and Used
Have sale rare • Matched pair gec • Kt66 new original - Free postage - New and Used
Kt66 gec vintage - grey, glass - £450.00
Matched pair tubes - Free postage - New and Used
Matched pair tubes - Free postage - New and Used
Kt66 lve vintage retro - kt66, - £150.00
Computer matched quad • Selected gold tested • Tubes made china - Free postage - New and Used
Computer matched quad • Selected gold tested • Tubes made china - Free postage - New and Used
Kt66 matched pair new boxed - new, - £120.00
Matched pair tubes • New unused boxed - Free postage - New and Used
Matched pair tubes • New unused boxed - Free postage - New and Used
Kt66 gold tad original - kt66, - £150.00
Kt66 marshall gold • Tad matched selected • Spares new unused - Free postage - New and Used
Kt66 marshall gold • Tad matched selected • Spares new unused - Free postage - New and Used
Kt66 lve vintage retro style - lve, - £75.00
Computer matched pair • Selected gold tested • Tubes made china - Free postage - New and Used
Computer matched pair • Selected gold tested • Tubes made china - Free postage - New and Used
Kt66 valve - kt66, tube) - £45.42
Gec general electric • Dusty places - Free postage - New and Used
Gec general electric • Dusty places - Free postage - New and Used
Matched pair kt66 clear - , - £450.00
- Free postage - New and Used
- Free postage - New and Used
Matched pair brimar foreign - brimar, - £50.00
Matched pair 6l6gt • Kt66 7581 valves • Tubes brimar foreign - Free postage - New and Used
Matched pair 6l6gt • Kt66 7581 valves • Tubes brimar foreign - Free postage - New and Used
Kt66 original marshall - marshall, spares - £30.00
Kt66 original marshall • Spares these are • Best value quality - Free postage - New and Used
Kt66 original marshall • Spares these are • Best value quality - Free postage - New and Used
Vacuum tube groove tubes - tube, - £85.12
This listing one • Groove tubes kt66 • Gold series matched - Free postage - New and Used
This listing one • Groove tubes kt66 • Gold series matched - Free postage - New and Used
Kt66 gold tad original - gold, - £75.00
Kt66 marshall gold • Tad matched selected • Spares new unused - Free postage - New and Used
Kt66 marshall gold • Tad matched selected • Spares new unused - Free postage - New and Used
New tubes gec - tubes, cv1075 - £660.26
Unused tubes kt66 • Cv1075 gec very • Strong emission matched - Free postage - New and Used
Unused tubes kt66 • Cv1075 gec very • Strong emission matched - Free postage - New and Used
Rare marconi kt66 vt75 - rare, fat - £300.00
Marconi british made • Fully tested avo • Vcm 163 - Free postage - New and Used
Marconi british made • Fully tested avo • Vcm 163 - Free postage - New and Used
Kt66 gec new and unused - unused, from - £139.00
Avo tested current • Shorts leaks etc • Believed new based - Free postage - New and Used
Avo tested current • Shorts leaks etc • Believed new based - Free postage - New and Used
Matched pair kt66 new - matched, - £80.00
Valves these are • Specially selected valve • Tubes gold class - Free postage - New and Used
Valves these are • Specially selected valve • Tubes gold class - Free postage - New and Used
Kt66 clear glass blk base - kt66, - £400.00
- Free postage - New and Used
- Free postage - New and Used
Osram marconi kt66 gec - kt66, grey - £151.50
Bought this new • Old stock many • Years ago never - Free postage - New and Used
Bought this new • Old stock many • Years ago never - Free postage - New and Used
Kt66 vintage osram grey - vintage, - £250.00
Kt66 osram new • Unused boxed - Free postage - New and Used
Kt66 osram new • Unused boxed - Free postage - New and Used
Valve tube boxes - boxes, size - £6.00
Valve tube boxes • Have divider keep • Secure suit 6l6g - Free postage - New and Used
Valve tube boxes • Have divider keep • Secure suit 6l6g - Free postage - New and Used
National electronics kt66 - electronics, - £16.95
- Free postage - New and Used
- Free postage - New and Used
Boxed nos gec - gec, marconi - £180.00
Date code april • 1965 spot welded • Gray plates clear - Free postage - New and Used
Date code april • 1965 spot welded • Gray plates clear - Free postage - New and Used
Marconi kt66 cv1075 - cv1075, clear - £49.99
Marconi brown base • Twin halo getter • Kt66 valve because - Free postage - New and Used
Marconi brown base • Twin halo getter • Kt66 valve because - Free postage - New and Used
Marconi gec kt66 - kt66, cv1075 - £125.00
Kt66 cv1075 clear • Glass valve tube • Fully tested avo - Free postage - New and Used
Kt66 cv1075 clear • Glass valve tube • Fully tested avo - Free postage - New and Used
Strong vintage genalex - strong, - £293.44
Have very nice • Tested strong live • Listened original vintage - Free postage - New and Used
Have very nice • Tested strong live • Listened original vintage - Free postage - New and Used
Gec kt66 twin - gec, halo - £340.00
Matched pair valves • Valve tube date • Codes 7234 7716 - Free postage - New and Used
Matched pair valves • Valve tube date • Codes 7234 7716 - Free postage - New and Used
Matched quad brimar - quad, - £100.00
Matched quad 6l6gt • Kt66 7581 valves • Tubes brimar foreign - Free postage - New and Used
Matched quad 6l6gt • Kt66 7581 valves • Tubes brimar foreign - Free postage - New and Used
Kt66 grey glass blk base - kt66, - £280.00
- Free postage - New and Used
- Free postage - New and Used
Kt66 gec nos - gec, tube - £225.00
New unused boxed - Free postage - New and Used
New unused boxed - Free postage - New and Used
Gec kt66 british old stock - british, - £246.31
Gec kt66 box • Marconi osram valve • Ltd pan getter - Free postage - New and Used
Gec kt66 box • Marconi osram valve • Ltd pan getter - Free postage - New and Used
Gec kt66 grey glass black - grey, - £100.00
Test results this • Valve one more • Item from - Free postage - New and Used
Test results this • Valve one more • Item from - Free postage - New and Used
Boxed nos gec kt66 valve - nos, - £120.00
Boxed nos gec • Kt66 valve date • Code 7816 week - Free postage - New and Used
Boxed nos gec • Kt66 valve date • Code 7816 week - Free postage - New and Used
Gec kt66 quad same batch - same, - £1077.70
Gec kt66 valves • Quad matched this • Have been certificated - Free postage - New and Used
Gec kt66 valves • Quad matched this • Have been certificated - Free postage - New and Used
Reissue genalex gold lion - reissue, - £127.58
400v plate screen • Gold lion kt66 • Tubes matched pair - Free postage - New and Used
400v plate screen • Gold lion kt66 • Tubes matched pair - Free postage - New and Used
Marconi kt66 valves - 2x, - £281.50
Mwt kt66 valves • Date code 1956 • This valve has - Free postage - New and Used
Mwt kt66 valves • Date code 1956 • This valve has - Free postage - New and Used
Matched pair kt66 - pair, - £450.00
- Free postage - New and Used
- Free postage - New and Used
Kt66 gec twin halo getters - kt66, - £180.00
Valve tube date • Code you buy • More than item - Free postage - New and Used
Valve tube date • Code you buy • More than item - Free postage - New and Used
Gec kt66 grey smoke glass - glass, j - £100.00
Gec kt66 grey • Smoke glass fully • Tested amplitrex at1000 - Free postage - New and Used
Gec kt66 grey • Smoke glass fully • Tested amplitrex at1000 - Free postage - New and Used
Golden dragon kt66 - kt66, super - £120.00
Golden dragon kt66 • Super matched pairs • Valves valve tube - Free postage - New and Used
Golden dragon kt66 • Super matched pairs • Valves valve tube - Free postage - New and Used
Gec kt66 valve - gec, - £100.00
Gec kt66 valve • Rubbed print date • Spot welded gray - Free postage - New and Used
Gec kt66 valve • Rubbed print date • Spot welded gray - Free postage - New and Used
Sovtek 1622 kt66 beam tetrode - 1622, - £40.00
Royal mail international • Sovtek 1622 kt66 • Beam tetrode power - Free postage - New and Used
Royal mail international • Sovtek 1622 kt66 • Beam tetrode power - Free postage - New and Used
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Everything you need to know about kt66 tubes
Whether you are looking for a brand-new or second-hand kt66 tubes, eBay offers one of the largest selections available online. With 48 active listings at the time of this page's last update, you have plenty of choice across different conditions, sellers and price points. The cheapest option currently starts at £6, while premium listings can reach £1077.7 — giving you a wide budget spread to work with. The average price of £193.12 can serve as a useful benchmark: listings below this tend to be used or auction-style, while those above often include extra accessories, warranties, or are sold by professional sellers with high feedback scores. Always check the seller's feedback rating and return policy before committing to a purchase. If you need the item quickly, filter by "Buy It Now" to avoid the uncertainty of auctions. For used items, look closely at the condition description and photos — terms like "good", "very good" and "like new" can mean very different things depending on the seller.