Pin Ceramic Tube
Pin Ceramic Tube
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 4pcs 12AX7 12AU7 9 Pin Ceramic TUBE Amplifier SOCKET9PC m  US $.90
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 7 Pin Ceramic Socket Shielded55 mm Set of 30 New US $15.00
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 4 TUBE SOCKETS 6 PINS FOR 2A5 6C6 CERAMIC US $7.50
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 4 TUBE SOCKETS 5 PINS 807 CERAMIC US $7.50
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 6 TUBE SOCKETS 7 PINS FOR 6X4 EZ90 CERAMIC US $7.50
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 209pin ceramic noval vacuum valve tube sockets chassis mount for 12AX7 12AT7 US $13.90
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 6N1P Vi 6N1P E88CC STRONG Tube SOCKETS MATCHED PAIR US $18.99
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 STC 4069A CV1372 Pentode Tubes NOS Ceramic base Large Pair US $26.00
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 x4x EL34 KT88 274B 6550A 8 PIN TUBE Ceramic SOCKET US $9.00
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 12AU7 12AX7 to 6SN7 6SL7 tube adapter adaptor socket converter brand new 1 piece US $14.50
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 Matched Pair Shuguang Psvane 300B T Vacuum Tube New Package Free shipping US $328.00
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 Matched Quad Premium Grade Psvane 6CA7 T¼ˆEL34 Vacuum Tube Gift Box US $328.00
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 2pcs For 12AX7 12AU7 9 Pin Audio Amplifier Silver TUBE New Ceramic SOCKET9PC US $1.88
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 6pcs For EL34 KT88 274B 8 PIN AMPS Ceramic TUBE SOCKET8PC m US $.90
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 Ceramic 7 Pin Tube Sockets LOT OF 25 PIECES NOS US $5.00
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 6AG5 Vacuum Tube Vintage Tube No Reserve One Cent US $.01
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 6AU4 RCA Vacuum Tube Vintage Tube No Reserve One Cent US $.01
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 7 pin Ceramic Mini Tube Socket US $1.25
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 4pcs 9 Pin Ceramic PCB Mount Tube Socket B9A for 12AX7 ECC82 6922 6DJ89B US $7.50
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 8x 9 Pin Tube Socket for 12AX712AU7 6DJ8 6N1P 6N2P US $8.99
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 10x Ceramic Mini 9 Pin Noval Gold Plated PCB Tube Socket US $19.80
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 6F8G to 6SN7 tube adapter adaptor 6SN7 to 6F8G socket converter new 1 piece US $17.50
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 2PC 5Pin 3 500Z 4 400 U5G Base Ceramic Tube Socket5C US $9.69
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 4 Pcs Professional Gold Plated 8 Pin Tube Socket EL34 6L6 KT88 6SN7 5AR4 US $24.00
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 10x Ceramic 7 Pin Gold Plated PCB Mount Tube Socket US $15.00
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 GU 32 832 Tube Socket 6S33S GU 32 GI 30 GU 29 6S41S GMI 6 US $.99
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 10X Ceramic 12 Pin Tube Socket Base PCB 4 50CA10 6CA10 6HF5 6C10 6JB5 Radio 12FA US $24.80
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 8 Pin Octal Ceramic Bottom Mount Tube Socket s For 6L6GC 5U4GB EL34 6SN7GTB US $2.49
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 50PC Plastic Tube socket 9 pin PCB Mount B9A Base S9Y US $35.00
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 8 PIN SOCKET GU 50 LS50 5C9S NOS LOT OF 4 Pcs US $20.00
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 10pcs Ceramic Valve Tube Socket 9 Pin B9A Base 12AX7 6922 9C 2G US $29.99
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 4 Piece Professional Gold Plated 4 Pin Tube Socket 300B 2A3 811A US $24.00
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 7 pin ceramic TUBE SOCKETS 40mm Lot of 30 NEW US $26.00
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 4 Piece Professional Gold Plated 9 Pin Tube Socket for 12AX7 5687 6AQ5 6DJ8 EF86 US $21.00
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 1pc 2pin Ceramic Tube Socket For 833 833A GU48 FU33 PL833A Valve21 US $29.59
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 213 pin Tube Socket fr Nixie GN4 ZM1020 B5092 B13B13F US $7.99
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 8EL34 KT88 274B 6550A 8 PIN TUBE Ceramic SOCKET8MPC US $13.99
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 4PC Plastic Tube socket 9 pin PCB Mount B9A Base S9Y US $3.50
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 1pcs EL34 KT88 274B 8 PIN Panel Ceramic TUBE SOCKET8PR US $1.95
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 Vintage Ceramic UV Base with Bayonet pin for UV 201 811A Tube Sockets trio US $9.99
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 RAREST 201 A TYPE 201A 01 A NICKEL BASE RARE PINS KENRAD UV 201 A BEAUTIFUL US $99.99
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 7 Pin Ceramic Wafer Tube Socket For 813 Etc SUPER BARGAIN US $3.99
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 2PC Tube Adapters 8pin to 4pin Ceramic Gold Socket S8C4 US $19.50
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 New Ceramic 9 pin vacuum tube socket PC mount valve US $1.75
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 4 x OCTAL CERAMIC TUBE SOCKET WRAP AROUND CONTACT NEW US $9.99
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 2PC 4Pin 2A3 300B 274A CMC Ceramic Gold Tube Socket UX4 US $10.55
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 9 Pin Ceramic PCB Mount GOLD Tube Socket 12AX7 ECC822 US $7.50
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 2 pcs Gold plated 9 pin tube socket made of fine ceramic good quality well built US $9.99
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 2 x OCTAL CMC STYLE GOLD CERAMIC TUBE SOCKET SUIT KT88 5U4G 6SN7 etc US $18.99
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 PAIR 6754 BENDIX National Tubes USA NOS Full Wave Rectifier Super 412A Gold Pins US $109.95
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 Radio Vacuum Tubes 6CB6A 6CF6 GE 4 NIB NOS US $12.99
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 8 pin Sockets for GU 50 P50 LS50 Lot of 20 US $60.00
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 1PCS For EL34 KT88 274B 8 PIN ANALOG AUDIO AMPLIFIER Ceramic TUBE SOCKET8PC US $1.88
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 10x NOS PHILIPS KS443 4700pF 47nF 63V 1 STYROFLEX HI END POLYSTYRENE CAPS US $5.99
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 2 pcs Gold plated 7 pin tube socket made of fine ceramic good quality well built US $9.99
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 Ceramic 12 Pin Tube Socket Base PCB For 50CA10 6CA10 6HF5 6C10 6JB5 Radio 12FA US $3.88
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 Vacuum Tubes 6189 12AU7 JAN SYLVANIA 5 NOS NIB TUBES US $55.99
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 2pcsFor 12AX7 AU7 7 Pin Ceramic TUBE SOCKET1901 US $3.99
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 9 Pin J Slot Tube Socket With Shield For Guitar Amps Fits 12AX7 Etc BARGAIN US $1.99
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 7 pin Ceramic Mini Tube Socket Lot of 200 US $150.00
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 Radio Vacuum Tubes 8BN8 RCA 5 NIB NOS US $20.99
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How To Repair Monitor Display Dim Problem
This 17" CRT Relisys OEM Monitor came in with the complaint of dark display (can't see back raster). Even though at the front panel through the On Screen Display (OSD), you have adjusted to maximum the back raster still would not show out and the whole display appeared quite dim. Normally whenever we see this kind of dim display problem we will head straight to the flyback transformer and adjust the screen (G2) voltage control to increase the voltage to the picture tube so that the display will become brighter again.
Somehow, in certain CRT Monitor designs, there is no screen (G2) control (knob) for you to adjust. It contains only the two knobs for you to adjust the focus (F1 and F2 knobs). Since we can't find any G2 control at the flyback transformer, one would always search for internal preset brightness control but unfortunately this model doesn't have one. It has only the B+ control and high voltage control preset. The high voltage preset has been glued with silicon and we can't simply tune this preset otherwise the Monitor will intermittently go into shutdown mode. The only preset left for you to adjust is the B+ control. Yes it is true that sometimes in certain Monitor you can tune up the B+ control preset to increase the brightness but it is not recommended due to the increase of the B+ voltage will increase the stress of the horizontal output transistor (HOT). The HOT may not last long and sometimes will blow in couple of hours.
In this Monitor, I tried to adjust the B+ preset to see if the brightness would appear or not but the outcome caused the display to go wider and still dim. If I continue to tune the B+ control, I'm afraid the HOT may blow in a very short time! This is just an experiment only, remember that do not tune the B+ control without a good reason.
After the Monitor had been used for couple of years, the CRT cathodes (emission) may have become weak and this caused the display to go dim. In order to make the display to become brighter again, you can increase the heater voltage from 6.3 volt to about 8 to 9 Volts. Or you can modify the G2 circuit to increase the voltage without tuning any B+ or high voltage preset in the Monitor. In this article I'm touching only on the modification of the G2 circuit.
Since the flyback transformer does not have the G2 control thus we can't trace from the flyback to look for the G2 wire. In fact we can trace backward from the CRT board to see at where the G2 wire came from. Yes it came from the Main board and not from the flyback transformer. Upon turning back the Main board, one can easily see the small G2 circuit that contains a diode, high voltage capacitor and some very high ohm resistor.
This is how the G2 circuit work. The high pulse AC supply came from one of the flyback transformer secondary pin and it go through an Ultra fast recovery diode. The function of the diode is to convert the high ac pulse into DC voltage and the high voltage capacitor (102 2kv-resin ceramic types) is to use to filter off the high frequency ripple and then the voltage flow through the resistors and the resistors determines (set) the output voltage. Once you understand how this circuit work you can easily modify the circuit or change the value of the resistors to make the G2 voltage increase.
From the picture you could clearly see that by removing the jumper and added in a 4.4 Mega Ohm (2.2M in series with another 2.2 M gave the result of 4.4 M Ohm) I could easily increase the G2 voltage. You may ask "How do you get the 4.4 M value?" In fact I tried few high ohm resistor values like starting from 100 K and then 1 M then 2.2 M before I conclude that 4.4 M ohm have the best display (brightness). If you remove the jumper (link) the display will become too bright and not good for the user.
In some Monitor designs, the G2 voltage can be in the highest value and if this happen no matter what resistor value you change or modify the circuit, the G2 output is voltage is still the same because the G2 voltage already in the maximum. You can only lower down the G2 voltage and there is no way to increase the G2 voltage! If this happen then you have to modify the heater voltage to increase the brightness.
Conclusion-In fact in any electronic circuit, if you truly understand how a particular circuit work, you can actually do some modification to make the electronic equipment work again. If the electronic equipment is considered beyond repair, there is no harm in trying out any modification method that you may think is the best to make the electronic equipment to work again. In order to do that, you must first equip yourself to have a basic understanding of electronics theory. For your information, the above problem was a common fault and I've already solved lots of it and made some nice income from a simple 10 minutes job. Have a great day my friend!
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