Pair Tube
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 NEW PAIR 27 X 1 1 4 BICYCLE GUMWALL TIRES W TUBES $39.99 Time Remaining: 11d 14h 32m Buy It Now for only: $39.99 Buy It Now |
 A+ PAIR 1962 12AX7 ECC83 Telefunken Vacuum Tubes $45.00 (9 Bids) Time Remaining: 12h 34m Bid now |
 PAIR RCA 6550 Vacuum Tubes USED Tested Very Good $27.60 (2 Bids) Time Remaining: 14h 37m Bid now |
 3 Pair All Sport White Tube Socks Sanitary Socks $3.99 Time Remaining: 29d 17h 32m Buy It Now for only: $3.99 Buy It Now |
 RCA Model MI 12188 Tube Monoblock Power Amplifiers Used Pair Tested and Working $1,000.00 Time Remaining: 9h 39m Buy It Now for only: $1,250.00 Buy It Now | Bid now |
 Matched Pair of Tungsol EL34 B 6CA7 tubes Tung sol $44.00 Time Remaining: 29d 19h 11m Buy It Now for only: $44.00 Buy It Now |
 NOS Matched Pair Tung Sol 6550 POWER TUBES New Old Stock Never used $202.50 (12 Bids) Time Remaining: 1d 17h 26m Bid now |
 Pair Ken Rad JAN CKR 6V6GT G VT 107 Tubes Test Excellent Current Matched $24.99 Time Remaining: 17h 51m Buy It Now for only: $59.99 Buy It Now | Bid now |
 Serfas Wire road bike tire+tube+str pair 700x23 Blue $56.00 Time Remaining: 20h 50m Buy It Now for only: $56.00 Buy It Now |
 Western Electric Tube Amp Power Transformers Pair One Trans NOS NR $56.00 (7 Bids) Time Remaining: 21h Bid now |
 NEW PAIR 26 X 1 3 8 SCHWINN S 6 BICYCLE TIRES W TUBES $43.00 Time Remaining: 28d 14h Buy It Now for only: $43.00 Buy It Now |
 Pair Ken Rad GE JAN CKR 6V6GT G VT 107 Tubes Test Excellent Current Matched $19.99 Time Remaining: 20h 25m Buy It Now for only: $49.99 Buy It Now | Bid now |
 A Pair of RCA Radiotron 80 280 Used Globe Tubes $21.50 (3 Bids) Time Remaining: 17h 14m Bid now |
 MEN ATHLETIC TUBE COTTON SOCKS WHITE 6 PAIR 9 15 $5.00 Time Remaining: 5d 12h 36m Buy It Now for only: $5.00 Buy It Now |
 Pair Dynaco Dynakit MKIII Mono tube amplifiers Guaranteed workingSweet $1,099.00 Time Remaining: 1d 15h 29m Bid now |
 Pair 3 x 5 Port Tubes $3.29 Time Remaining: 24d 11h 13m Buy It Now for only: $3.29 Buy It Now |
 PAIR OF SYLVANIA 6CA7 EL34 FAT BOTTLE TYPE TRIPLE GETTER TUBES FAT BOY $41.00 (3 Bids) Time Remaining: 1d 21h 5m Bid now |
 PAIR Schoeps N20B power supplies for tube microphone with ac701 $405.00 (2 Bids) Time Remaining: 14h 27m Bid now |
 2x NEW Tung Sol 12AX7 Reissue TungSol Vacuum Tube ECC83 Matched Pair TESTED $24.50 Time Remaining: 26d 22h 41m Buy It Now for only: $24.50 Buy It Now |
 Telefunken vintage tube mic preamps VE12 pair $2,500.00 Time Remaining: 2d 14h Bid now |
 PAIR OF RCA 6DN7 NOS NIB TUBES $16.99 Time Remaining: 29d 13h 58m Buy It Now for only: $16.99 Buy It Now |
 WESTERN ELECTRIC 274B TUBE NOS USED MACHING PAIR N01 $1,284.00 (10 Bids) Time Remaining: 21h 30m Bid now |
 Pair DeForest Audion DV 2 Radio Audio Amplifier Tubes Good $26.55 (4 Bids) Time Remaining: 1d 21h 10m Bid now |
 Pair of 2 Soma STEEL CORE Tire Levers unbreakable nylon coated bike bicycle tube $6.50 Time Remaining: 24d 5h 12m Buy It Now for only: $6.50 Buy It Now |
 Pair Telefunken ECC83 12AX7 Tubes Diamond Test Strong $10.49 (2 Bids) Time Remaining: 20h 15m Bid now |
 Mens Striped Tube Socks 6 Pair Size 10 13 Knit In USA 225 In Long New In Pack $15.95 Time Remaining: 1d 18h 1m Buy It Now for only: $15.95 Buy It Now |
 PAIR OF SYLVANIA 6CA7 EL34 FAT GLASS BODY TUBES DOUBLE TOP GETTERS FAT BOY $76.00 (8 Bids) Time Remaining: 1d 21h 12m Bid now |
 Vintage Pair Tung Sol 6V6GTA Audio Tubes Back Plates Matched TestedNR $0.98 (1 Bid) Time Remaining: 18h 10m Bid now |
 2 24x175 195 2125 Bicycle Inner Tubes Pair $11.95 Time Remaining: 18d 13h 33m Buy It Now for only: $11.95 Buy It Now |
 Pair CBS JAN CHS 6V6GTY Tubes Test Excellent Well Matched Black Plates $24.99 Time Remaining: 12h 42m Buy It Now for only: $59.99 Buy It Now | Bid now |
 matched pair 6BQ5 EL84 vacuum tubes $7.99 Time Remaining: 17d 8h 21m Buy It Now for only: $7.99 Buy It Now |
 Matched Pair Sylvania 2A3 NOS Amplifier Tubes Triplett 3444 Tested New In Box $12.50 (2 Bids) Time Remaining: 1d 22h 21m Bid now |
 1 Pair of Western Electric 420A 5755 Amplifier Vacuum Tubes Tested Strong $49.99 Time Remaining: 17h 49m Buy It Now for only: $79.99 Buy It Now | Bid now |
 Honda CRF50 Pit Bike Tire Pair with Tubes 250 10 crf 50 Xr ttr ttr50 xr50 $57.95 Time Remaining: 19d 14h 53m Buy It Now for only: $57.95 Buy It Now |
 Mullard NOS 12AX7 CV4004 Military ECC83 tubes Matched Pair New In Boxes $178.50 (7 Bids) Time Remaining: 1d 22h 24m Bid now |
 Converse Long Tube Socks over the calf shoe size 7 13 2 packs 12 pairs total $19.99 Time Remaining: 23d 12h 38m Buy It Now for only: $19.99 Buy It Now |
 1 Pair GE 6201 12AT7WA 3 Mica Black Plate Amplifier Vacuum Tubes Tested NOS $11.00 (2 Bids) Time Remaining: 20h 44m Bid now |
 Pair NOS Cunningham C 327 Radio Tubes Globe Shaped Earliest Variety $18.50 (4 Bids) Time Remaining: 1d 20h 54m Bid now |
 Radiantz LED Light Pods 15 Pair Amber LEDs Clear Tube $26.99 Time Remaining: 18d 17h 5m Buy It Now for only: $26.99 Buy It Now |
 PAIR 1962 12AX7 ECC83 Telefunken Vacuum Tubes DIAMOND $32.00 (7 Bids) Time Remaining: 2d 12h 37m Bid now |
 Pair JAN GE 5670W Vacuum Tubes 6N3 396A 2C51 $9.99 Time Remaining: 14d 12h 34m Buy It Now for only: $9.99 Buy It Now |
 Pair Sylvania Type 71 A Radio Amplifier Tubes Good $18.50 (3 Bids) Time Remaining: 1d 21h Bid now |
 28 LOBDELL WOOD NOS New BICYCLE RIMS for SINGLE TUBE TIRES pair Wooden Vintage $420.00 Time Remaining: 1d 21h 48m Bid now |
 2x NEW JJ Tesla EL34 Vacuum Tubes Matched Pair TESTED $26.00 Time Remaining: 28d 20h 9m Buy It Now for only: $26.00 Buy It Now |
 6267 EF86 Amperex pair Made in Holland mesh plate vacuum tubes tested $9.99 Time Remaining: 1d 20h 3m Bid now |
 EL34 Winged C Tubes EL34C WC SED Matched Power Tube $72.00 Time Remaining: 13d 11h 22m Buy It Now for only: $72.00 Buy It Now |
 WESTERN ELECTRIC 274B TUBE NOS USED MACHING PAIR N03 ENGRAVED BASE $2,175.00 (14 Bids) Time Remaining: 21h 44m Bid now |
 Pair Sylvania 6V6GT Smoked Glass Chrome Top Vacuum Tubes Matched Ip Date $4.58 (4 Bids) Time Remaining: 1d 13h 13m Bid now |
 PAIR 10 SPEAKER SUB WOOFER TUBE STYLE 2 PIECE GRILLS $19.75 Time Remaining: 10d 9h 13m Buy It Now for only: $19.75 Buy It Now |
 Pair Cunningham 6V6G Audio Amplifier Tubes Good $22.50 (6 Bids) Time Remaining: 1d 21h 4m Bid now |
 PAIR OF RCA 25L6 NOS NIB TUBES $9.99 Time Remaining: 29d 13h 24m Buy It Now for only: $9.99 Buy It Now |
 2 TELEFUNKEN 12AX7 ECC83 TUBES TV 7 Tested STRONG Matched Valve Pair $27.00 (3 Bids) Time Remaining: 2d 20h 42m Bid now |
 Vintage Matched Pair AMPEREX 6922 PQ Vacuum Tubes Gold Pins Premium Quality USA $35.00 (4 Bids) Time Remaining: 2d 20h 24m Bid now |
 2x NEW JJ Tesla EL84 6BQ5 Vacuum Tubes Matched Pair TESTED $18.95 Time Remaining: 16d 3h 13m Buy It Now for only: $18.95 Buy It Now |
 Pair Tung Sol VT 67 Special type 30 Radio Tubes Good $10.49 (2 Bids) Time Remaining: 1d 20h 45m Bid now |
 Matched Pair Psvane 5881 Vacuum Tubes Similar to 6L6GC 6L6 2PCS $33.99 Time Remaining: 5d 20h 56m Buy It Now for only: $33.99 Buy It Now |
 Pair Perryman PA 201 A Globe Shaped Radio Tubes Good $10.49 (2 Bids) Time Remaining: 1d 20h 55m Bid now |
 Matched Pair Tung Sol 6550 POWER TUBES Looks like theyve never been used $123.50 (5 Bids) Time Remaining: 3d 14h 47m Bid now |
 5 Pair Wigwam 650 Cotton Sport Crew Lenth Tube Sock Made in USA 105 12 mens $20.00 Time Remaining: 26d 9h 52m Buy It Now for only: $20.00 Buy It Now |
 RCA pair of 5881 tubes new in original boxes Nice tubes $20.49 (4 Bids) Time Remaining: 2d 18h 10m Bid now |
 2x NEW JJ Tesla 12AX7 ECC83 ECC83S Vacuum Tube Matched Pair TESTED $19.95 Time Remaining: 18d 12h 2m Buy It Now for only: $19.95 Buy It Now |
 MATCHED PAIR GE JG 6072 BLACK PLATE TRIPLE MICA TUBE 12AY7 KONDO $9.95 (1 Bid) Time Remaining: 1d 6h 31m Bid now |
 NICE PAIR WESTERN ELECTRIC VT 25 A CERAMIC BASE VACUUM TUBESVERY NICE $58.00 (6 Bids) Time Remaining: 1d 21h 5m Bid now |
 NEW Pair Michelin Pro Race 3 Tires Blue Black 700 x 23 Tubes FREE SHIPPING $85.00 Time Remaining: 7d 12h 9m Buy It Now for only: $85.00 Buy It Now |
 Pair NOS Cunningham CX 301 A Radio Tubes 1920s $70.99 (9 Bids) Time Remaining: 1d 21h 4m Bid now |
 Matched Pair PSVANE Vacuum Tubes 300B HiFi Series $168.00 Time Remaining: 6d 10h 57m Buy It Now for only: $168.00 Buy It Now |
 Pair National Union NX 226 Globe Shaped Radio Amp Tubes Good $11.00 (2 Bids) Time Remaining: 1d 20h 59m Bid now |
 1 Pair of RFT 12AX7 tubes NOS $10.50 (2 Bids) Time Remaining: 1d 21h 58m Bid now |
 SUPER DEAL 1 Pair 18X 195 All WHITE Bicycle Tires and Tubes NEW Knobby Tires $29.95 Time Remaining: 5d 21h 53m Buy It Now for only: $29.95 Buy It Now |
 PAIR OF RCA VICTOR 6A3 SPRING LOADED FILAMENT TUBES THE 63V VERSION OF 2A3 $67.00 (4 Bids) Time Remaining: 1d 21h 38m Bid now |
 new NOS matched pairs of 6SL7GT vacuum tubes $7.99 Time Remaining: 17d 10h 42m Buy It Now for only: $7.99 Buy It Now |
 A Vintage NOS PAIR Western Electric 310A tubes $105.00 (3 Bids) Time Remaining: 1d 18h Buy It Now for only: $420.00 Buy It Now | Bid now |
 2 Mullard Hammond ECC83 Tubes 12AX7 MATCHED PAIR $13.49 (4 Bids) Time Remaining: 3d 20h 12m Bid now |
 572B matched pair2 ham radio tubes new in box $94.99 Time Remaining: 10h 22m Buy It Now for only: $94.99 Buy It Now |
 WESTERN ELECTRIC 274B TUBE NOS USED MACHING PAIR N04 $1,375.00 (19 Bids) Time Remaining: 1d 10h 21m Bid now |
 A Pair Red Cycling MTB Bike Bicycle Tube Type Handlebar Rubber Grips Lock On $6.69 Time Remaining: 10d 4h 56m Buy It Now for only: $6.69 Buy It Now |
 MATCHED TRIO PAIR + 1 VHT SOVTEK KT88 AMPLIFIER POWER TUBES $19.99 (1 Bid) Time Remaining: 2d 19h 41m Bid now |
 Nice pair of Tung Sol 5881 tubes New Strong Gain not matched $21.50 (3 Bids) Time Remaining: 2d 18h Bid now |
 Pair 08518 Fork Tube Assembly 2 Over for Harley Davidson FXST 1984 and Up NEW $119.99 Time Remaining: 29d 1m Buy It Now for only: $119.99 Buy It Now |
 5670 WA Raytheon pair premium grade 2C51W vacuum tubes tested $9.99 Time Remaining: 1d 19h 52m Bid now |
 2x NEW JJ Tesla 6L6 6L6GC Vacuum Tubes Matched Pair TESTED $34.00 Time Remaining: 15d 19h 52m Buy It Now for only: $34.00 Buy It Now |
 Matched Pair RCA 12AX7 A Audio Preamp Tubes $7.00 (4 Bids) Time Remaining: 1d 19h 56m Bid now |
 GORGEOUSLY RESTORED PAIR OF QUAD II 2 TUBE AMPLIFIERS AMPS $1,898.00 Time Remaining: 2d 19h 21m Buy It Now for only: $2,498.00 Buy It Now | Bid now |
 2 24x175 195 2125 Bicycle Inner Tubes Pair $11.95 Time Remaining: 20d 18h 37m Buy It Now for only: $11.95 Buy It Now |
 WESTERN ELECTRIC 350B TUBE NOS USED MACHING PAIR N01 $353.00 (11 Bids) Time Remaining: 21h 17m Bid now |
 6V6 JJ Vacuum Tubes MATCHED PAIR 6v6 s Tesla NEW $30.00 Time Remaining: 2d 10h 29m Buy It Now for only: $30.00 Buy It Now |
 Pair RCA BP 12AX7 Audio Preamp Tubes $4.50 (1 Bid) Time Remaining: 1d 19h 16m Bid now |
 Pair RCA 12AX7 Audio Preamp Tubes $4.75 (2 Bids) Time Remaining: 1d 19h 21m Bid now |
 GE 6DJ8 ECC88 SMOKIES VACUUM TUBE 1960S MATCHED PAIR PLATE GETTER TONE ZA $29.99 Time Remaining: 27d 17h 4m Buy It Now for only: $29.99 Buy It Now |
 Pair 1960 RCA 12AX7 Audio Preamp Tubes $4.50 (1 Bid) Time Remaining: 1d 19h 28m Bid now |
 Pair 2 x 2 Port Tubes $1.99 Time Remaining: 11d 13h 26m Buy It Now for only: $1.99 Buy It Now |
 MATCHED PAIR OF SYLVANIA 6SN7W BLACK BASE TALL GLASS 1945 TUBES NEW IN BOXES $107.50 (12 Bids) Time Remaining: 1d 21h 7m Bid now |
 PYU BEADS ANCIENT PYU BEADS ONE PAIR OF TIGER TUBE BEADS 4 SALE $34.10 (6 Bids) Time Remaining: 2d 23h 58m Bid now |
 3 pair TUBE READING GLASSES COMPACT READER POWER +200 $21.00 Time Remaining: 29d 20h 18m Buy It Now for only: $21.00 Buy It Now |
 Pair of mono SCOTT 121 Dynaural tube preamp $1,175.00 (5 Bids) Time Remaining: 1d 15h 13m Bid now |
 Vintage US made GE General Electrics 6550 KT 88 output tube pair $150.00 Time Remaining: 29d 12h 23m Buy It Now for only: $150.00 Buy It Now |
 1 Pair of RCA JAN CRC 6SN7GT Amplifier Vacuum Tubes Test Strong $32.15 (3 Bids) Time Remaining: 21h Bid now |
 1 Pair of RCA JAN CRC 6SN7GT VT 231 Amplifier Vacuum Tubes Test Strong $41.00 (8 Bids) Time Remaining: 21h 2m Bid now |
 1 Pair Matched PSVANE 300B HIFI Vacuum Tubes $168.00 Time Remaining: 9d 3h 27m Buy It Now for only: $168.00 Buy It Now |
Pair Tube
A pair of vertical, open-ended glass tubes inserted into a horizontal pipe are often used together to measure?
Find , the gauge pressure at the bottom of tube 1. (Gauge pressure is the pressure in excess of outside atmospheric pressure.)
They are called piezometers and in very low pressure piping they can be used singly to indicate the gage pressure in the pipe at that location. Together, but separated by some distance they can be used to determine the dynamic friction loss of the flow. Also , but close together they can be used to measure flow volume when installed on each side of an orifice plate or a tapered nozzle. The difference of fluid height in each tube will be a measure of the velocity energy variation at the obstruction. This can be used in a formula for the orifice or nozzle to compute the fluid velocity in the pipe.
The problem with pressure is the limitation of length. For every pound (psig) of pressure, water will rise 2.31 feet. With just a 10 psig system the tubes will have to be 25 ft high.
The only time I recall seen them was 54 years ago in Prof. Hill's hydraylics lab at the U of F.
 Replacement Medium Earmold Earbud One Pair for Two-Way Radio Coil Tube Audio Kits Sale Price: $4.95  Eligible for free shipping!Availability: Usually ships in 1-2 business days  |
 Midland AVPH3 Transparent Security Headsets with PTT/VOX (Pair) List Price: Sale Price: $14.99 You save: $25.01 (63%) Eligible for free shipping!Availability: Usually ships in 24 hours |
 Replacement Small Earmold Earbud One Pair for Two-Way Radio Coil Tube Audio Kits Sale Price: $4.95 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 A PAIR SCOPE LOW RING 30MM TUBE 1 INCH INSERT FOR RUGER List Price: Sale Price: Too low to display Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 Royer Labs Matched Pair R-122V Vacuum Tube Active Large-Element Ribbon Microphone, Nickel List Price: Sale Price: $5,690.00 You save: $410.00 (7%) Eligible for free shipping!Availability: Usually ships in 24 hours |
 Mojave Audio Small Diaphragm Matched Pair Tube Condenser Professional Microphones Sale Price: $1,595.00 Eligible for free shipping!Availability: Usually ships in 24 hours |
 Tube Amp Doctor 6L6WGC-STR Black Plate (Matched Pair) List Price: Sale Price: $45.99 |
 Pair of Brand New Tview T721pl-black Car Headrests with 7" Tft-lcd Monitors Pre-installed + Dual Sensor Ir Transmitter Built in 2 Free Remotes + Wiring Included **16:9 Wide Screen Mobile Theater Display** Sale Price: $144.95 Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 A PAIR SCOPE LOW SILVER RING 30MM TUBE 1 INCH INSERT FOR RUGER List Price: Sale Price: $13.57 You save: $36.38 (73%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
 AudioQuest Kingcobra audio cable - RCA plugs 0.5m (1.64') stereo pair List Price: Sale Price: $170.00 |
Laney CUB 10 class A/B all tube guitar amp demo
