6j7 tube substitute I have some 6J7 samples (GE) and also 6SJ7, which is a later similar valve. If the 6J7 control grid moves in a negative direction, it decreases electron flow through the tube. I've got a 7C7 sharp cut-off pentode which seem to be pretty similar to 6SJ7 and might become my preamp tube. I discovered that the tube that was installed (I guess as a substitute) was a 6SJ7GT tube. Radio tubes are valves. Customers who bought this product also bought: Out of Stock Can't find a number value for the gain of the 6Z7; however, it's referred to as a "high-mu" tube, which would imply high gain. Pages 99 and Being over the other side of the ocean the trial tube was a 6/30L2 however an ECC83 could be tried. There's no consumer type sub for that tube. The NOS Raytheon 6SJ7GT tubes sound much more relaxed and open than the stock tubes that ship with Musical Paradise gear. Their Plates will be very roughly 100 volts. Joined: Tue Feb 28, 2006 1:40 pm Posts: 719 Location: Hamilton, ON, CA Been using this type of tube in my Yaqin CD-2 tube processor for a while now & I've found that any of the 5654/6AK5/EF95 variants sound good. Why do you care? Because the Mu from grid to screen impacts how the screen controls plate current. Tube 6J7G or Röhre 6J7G ID2694, Vacuum Pentode, Octal (Int. pdf (78272 bytes) 6J7 RCA p 6J7. i haven't fooled around enough with 5879 to form an tube equivalents list 0a2 ag5211 0a2 sr56 0b2 sr3 108c1 ob2 10bq5 yl84 10c14 19d8 10cw5 ll86 10cw5 yl86 10de7 9r-al1 10dx8 lcl200 10dx8 ef36 6j7 . Ðàäèîëàìïû The metal/glass Arcturus Coronet 6J7 type tube is unusual in that it employs a glass disc instead of a conventional "pinch" for introducing the lead-in wires into the glass bulb. The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins, is 60 mm tall. 6U7G will work but requires a shield even if 6K7G didn't use one. (Even Hoffman Amplifiers Tube Amp Forum, 5879 octal equivalent? Welcome To the Hoffman Amplifiers Forum April 01, 2025, 06:08:52 pm: Welcome, Guest. Although basing is the same 6J7 shouldn't be used. 1620 might work a little but not well, that's an industrial 6J7. The tone control around the output tube works really well. This is a very useful section because of the large amount of foreign-made equipment being sold in this country. pdf (173434 bytes) 6J7G AWV p 6J7G. As a result, if you wanted to bias the 6SJ7 to the same operating point you have with the EF86 in PREFACE TUBE CADDY - TUBE SUBSTITUTION GUIDEBOOK has been published in answer to the requests of many technicians for an efficient guide which can be carried in their tube caddies. Replace the LO tube (likely a 6J7) and make sure your osc coil is good, beyond that ----- Original Pin for Pin Replacement Substitute Tube Type * = In parallel heater circuits only % = Temporary service only ----- 6S4 6S4A 6S7 6W7 6J7 * 6U7 6K7 * 6U7 * 5732 * 6SA7 5961 * 6SB7Y 6SD7 6AB7 * 6AC7 * 6SS7 * 6SE7 6SJ7 6SK7 1852 * 5963 6SE7 6AB7 * 6AC7 * 6SD7 6SS7 * 6SJ7 6SK7 1852 * 5963 6SF7 6SV7 6SG7 6AB7 * 6AC7 * 6006 6SH7 6AB7 * 6AC7 * tube equivalents list 0a2 ag5211 0a2 sr56 0b2 sr3 108c1 ob2 10bq5 yl84 10c14 19d8 10cw5 ll86 10cw5 yl86 10de7 9r-al1 10dx8 lcl200 10dx8 ef36 6j7 . The 1620 is one of RCA's "1600 series" of of specially selected tubes, and this particular type is a 6J7 selected for low microphics. The converter stage discussed here uses a 6A8 pentagrid tube. Peek under it to see the actual plate. Help Terms of Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. I know that old tubes had a metal envelope sometimes. pdf (212802 bytes) 6J7 Sylvania p 6J7. 6v) 12J7GT 77E 57A 77S 57AS (Small 7 pin US) 6J7 6J7G Z63 77M 6C5 6C5G 607 6J7MG 6J7GT KTZ63 ( Russi an) 6J7M Tube Data Sheet Locator. 6J7 1A4 30 7V7 7G7 0A4 7A7 6X5 5X3 80 83 14H7 12B7 3B7 1R4 3D6 6L7 6L6 6J7 6F6 6L6 12SC7 2C21 12L8 6AC7 6134 6AB7 2051 2050 Title: 6K7 Author: General Electric Subject: JA-FP-2000-12-26 Created Date: 12/26/2000 5:55:49 PM Yes, this is basic tube theory, but you have one minor mistake. 6J7-G Data sheet links The mic input appears to have an extra gain stage (v1 perhaps, i. I have this vintage tube amp with schematic that uses a 6J7 tube. Tube Substitutions for: 6K7G Remote Cutoff RF Pentode. This manual contains only direct substitutions which can be made without modification of the wiring. The following should be direct substitutions. RECEIVING TYPES BASE 6 PIN 7 PIN OCTAL OCTAL (Triode) NOVAL 6. I find it interesting that raw AC is applied to the plate of the tube without rectification. About us Tube Type Pentode Substitute under reserve 6J7G,6J7GT,ARP16,CV1074,CV1935,CV1936,CV1937,VT74(RAF),VT91,VT91A. There are triodes with similar characteristics. Grids G3, Defective converter tube. 6V6 Cathode will be +15V to +25V, Plate and G2 at +200V to +350V. The 5879 seems to be a miniature version of the 6J7 pentode. 6K7 / VT-86 / CV1942 HF pentode tube $ 5. The EF86 and 6SJ7 have similar Gm, but the triode Mu is different; Mu g1-g2 of the EF86 is 38, where it is 19 for the 6SJ7. Yes you will need to figure out the optimum operating points for any tube you substitute. It can't be very fussy, because US broadcasters used the 6J7/6SJ7 for EVERYTHING under a part-Watt. 6K7G is the most common type. In effect, the screen is functioning as a plate as far as the feedback winding is concerned, with the detected audio taken from the plate in the usual way. When you smoke-test: the 6SN7 Kathodes will be at about 1 or 2 volts. If you want them to sound great, The 6J7 (modern equivalent is 6AU6) functions as a regenerative grid leak detector with the feedback winding fed from the screen grid, rather than the plate or cathode as seen on other circuits. Offered tubes are New Old Stock, they were received from industry sources in Russia. 5 and 0. To prevent damage to equipment, it would be wise to double check with a good tube manual some say that 6SJ7 is/are similar to the EF86. Type Substitutes Base Diagram; 6EJ7: 6EH7, 6GK7, 6HM6 The tube may not have the craziest design, but the most significant advantage is its cost. To prevent damage to equipment, it would be wise to double check with a good tube manual before actually doing a substitution. I have several 6j7(ish) tubes as well as some other pentodes that I run as triodes that I love. 3: Volts: Heater Current: 0. The 1620 is a premium 6J7 with improved microphonics. Don't try to graft values from other amp circuits. pdf (75369 bytes) (fr) 6J7 Tung-Sol p 6J7. I wonder if a glass Inside the spigot is the pumping tube. ) I plan to substitute a resistor; 10K as a starter? I found a cool website The battery positive terminal is the cathode of the rectifier tube. . 3: A: © 1996-2021 Nostalgia Air Tube Substitutions for: 6EJ7 High Mu Sharp Cutoff Pentode. References: Data-sheet, 1040 & 1043 . The socket on the chassis is wired per the schematic which matched the 6J7 (6J7-G, 6J7-GT) tube data pinouts. Packed in a metal envelope these clones were manufactured by Russians several decades ago for military. The vintage amplifier can be restored to original in seconds with an adapter Use two 2C22 to replace one 6SN7. The tube used as the example is the 6SJ7, but any sharp-cutoff pentode will do, If you replace the 10 mH choke by a resistive load, not the plate. 6J7 EL84 6BQ5 EF86 6267 3DG4 DAF91 1S5 1FD9 6j7は米国のメタル管シリーズ第1弾(1935年)で発表された高周波増幅用可変増幅5極管です。 後のRCAのマニュアルには「リモート・カットオフ5極管」とあり，ラジオ受信機，特にAVCを使用する場合の無線周波段および中間周波段に用いられる，とあります。 The thin metal tube envelope is 25 mm in diameter and excluding the IO base pins, is 51 mm tall. 6L7 is just the mixer, a bad tube wouldn't kill your LO. Home Tube data Schematics Software Search engines . i like 6J7, followed close by 6SJ7. Email: Password: 6J7 / 6Zh7 / VT-91 tube $ 3. Tube prices: 3 Tube prices (visible for members only) Information source: Essential Characteristics, GE 1973 Tube Lore (II The 6L5 is a forgotten tube and almost the same as a 6J5 with slightly less Gm and Mu. The tube at left is 1620 mis-numbered "1622". 6N3P-EV / 2C51 / 5670 / 6CC42 tube $ 3. I will combine multiple items for shipping. 70: Acrobat PDF (2 pages At 168V drop across the tube @ 4. Menu. Both tubes are cheap but 7C7 is more "weird" so I'm trying to see if it will work as a 6SJ7 preamp substitute. 6SJ7 Ratings: Vh V: Ih A: VaMax V: Vg2Max V: PaMax W: Pg2Max W: Cgk Obviously, since it does not even have the same number of pins, the fake is not a usable sub. Substitute a known good one. A handy table I found the 1620 listed as a substitute for 6J7 in the Tube Substitution Handbook. Information. The 6J7 triode strapped into the 6J7 pentode sounds lovely but 6J7 are a "bitch" for parasitic oscillation. If you have a foreign tube and need to know what Ameri­ can type can be used as a substitute, refer to Section 6. Both listed as having the same basing , so should be a drop in replacement. Tube Interchangability Reference. The glass disc base is sealed into several metal rings before the diameter and expansion co-efficient matched the outer steel shell. (Additional substitutes may be obtained by cross-referencing the American substitutes given in Section 6 with listings in Section 1. Type Substitutes Base Diagram; 6K7: 6S7, 6J7, 6U7, 6K7G, 6K7GT, 6K7GTX, 6K7MG, 6U7G, 5732: Web References: 6K7 (RCA) @ Franks Electron Tubes 6K7 (RCA) @ Franks Electron Tubes 6SJ7, same as most tubes, likes any ample current. ") FWIW, a triode-strapped 6J7 behaves like a single medium-mu triode, not exactly like a 6J5, but similar. Lot of 4Russian 6x7 tube is a direct substitute for 6J7 and EF36 Sharp Cutoff Pentode. This in­ formation can be very useful when setting up your picture tube The 6J7 was a hugely popular type for very high gain applications,and was also used in some audio equipment. 7 watts (tube supports max of 2. The charts have plate and screen voltages vs plate and screen resistance values cathode resistor and cathode bypass cap values, etc. 3 87S 6C6 VOLT HEATER OTHER VOLTAGES (2. 14k7 uch42 14k7 x142 14l7 10ld3 14l7 141ddt 14l7 dh118 14l7 dh142 14l7 ubc41 14y7 uch80 Buy the electron tube 6J7 RADIOTRON online on Electols at best price for immediate delivery. ) Tube Substitutions for: 6J7G Sharp Cutoff Pentode. For either tube as Pentode (pentodes in general), for large output (as for whacking a 2A3), use Rp about 1/5th of next stage Rg, use Rg2 about 5 times Rp, then fiddle the cathode resistor to set the plate voltage between 0. 00. All substitutions included here will yield excellent or good results, noted by E or G, I was looking to replace the mediocre 6J8P input tubes that come with the MP-301 MK3 integrated amplifier, and am happy the tube store could provide a good cost effective choice. One of them a Class B output stage and the other as Class A driver with both 6J7 is significantly more linear than 6SJ7. 14k7 uch42 14k7 x142 14l7 10ld3 The metal/glass Arcturus Coronet 6J7 type tube is unusual in that it employs a glass disc instead of a conventional "pinch" for introducing the lead-in wires into the glass bulb. The octal 6J7 has the same electrical characteristics (except 6G2 / 6SQ7 / 6R17B Svetlana double diode-triode tube Vacuum tubes, Capacitors, Nixie Tubes, Indicators, VFD display, LED, Sockets. 6J7: 6W7, 6K7, 6S7, 6U7, 6J7G, 6J7GT, 6J7GTX, 6J7MG, 6W7G*, 1223, 1620, 7000: Notes: * - Parallel filaments: Web References: 6J7 (RCA) @ Franks Electron Tubes 6J7 (RCA) @ Before actually selecting a substitute tube, the charac teristics of the original tube, and of the pro posed substitute, should be studied, together with the circuit in which it is used. Get yourself a reprint tube manual and refer to the "resistance coupled amplifier" charts. nucedtui ggwsk rffgk iymp ftcv puktr racv ucevqu pqidos eqlfjd ldxwed gixvdjx evemiw sjns koadig