改訂記録/ Revision History

定期的に改訂します。 但しマイナーな変更では省略します。
Revision will be done periodically. Minor changes will be omitted. (2001/07/31)
Date
Contents
Reason of revision
1999/10New 6384 STC, 6AV5GA STC testBoth new one
Note: "STC" =STC amp
New Home made RX's mainte/rebuildNew one
1999/11New 6GW8 STCNewly built
1999/12New Reprod BC 0V2, 1V2, 4T super Partial rev's on 0V2/ 4T super-het
2000/01New 6AN5 para SEPPNewly built
2000/03New 30A5 para STCNewly built
2000/04New Add descriptions of relations b/w P-G NFB and STC
2000/05Rev "A study for STC" Warnings for triode STC operation
2000/07Temp trial 6JS6C STCNewly built
2000/08New 6R-HP3 STCNewly built
2000/09Temp trial 6CW5 STC/ New 6550 STC Newly built
2001/01D-NFB mods 6JS6C/EL509 SS
New EL34 para STC
Trial of new NFB circuit by Mr Noro
Simple para version of EL34
Note: "SS" =Semi-STC amp
2001/02Semi-STC remodel 6JS6C/EL509
New Restore old RX
Trial of P-G NFB'ed cath-fol driven
Restoration of GT super het RX
2001/04New 6Y6G/GT SEPPNewly built
2001/05Renewal 6AC5GT SS/ CV18 GG With NFB'ed cath-foll dr/ Remodel
2001/07New 300B, 1626, Univ-triodes etc. As semi-STC triodes
Note: "Univ" =universal amp
2001/08Revival of 6R-HP3 with 6AW8A, 6HZ8 Univ STC of "Tri-Pen" video tubes
2001/09New Mainte of RXs Part 2 1V2 >>> super, add X-tal conv/Q5'er
2001/10Mods Univ triodes SS
Revival 6LR8 STC
Reconfigure, Add Beam and Pentode,
Rebuild with larger OPT
2002/03Mods 6AC5GT SSChanged dir couple-driver to 12BH7A
2002/04New CV18 para single/PP
New 6N7GT PP/ UZ79 para PP
Add Trouble protection of STC V1
As A2 class booster amp
As B class booster amp
To protect final stage from trouble
2002/07New 6BQ5 SS-PPNewly built
2002/08Mods 2A3/45 SS, 300B SSBoth changed VFB tube to 12B4A
2002/09New G2 driven P-K NFB'ed sweeperEvaluation of G2 driven
2002/10New Synthetic triode amp by
------- Mr Nonomura
Evaluation of a variation of
P-G NFB'ed cathode follower driven
2002/11New Two QRP (mini pwr) no-NFB Single and pushpull one watt amps
2003/07New 6BM8 G2 driven single/pp ampsNewly designed/built
2003/08New Output impedance of amps Add new information
2003/09New 6BM8/6BQ5 G1G2 driven SSAdd newly tested amps
2003/10New Universal G1G2 driven SS
Mods Univ. vari-G1/fixed-G2 driven SS
Add new amp
By G2 driven remodeled
2003/11Mods Std BC band 1V2 RX
Mods 4 tube super-het RX
Separated 455kHz IFT construction
To cathode follower driven detector
IFT selectivity improvement
From 5 tubes super-het
2003/12Rev Univ. G1G2 driven
Mods Univ. vari-G1/fixed-G2 driven
Renamed as "Unified" G1G2 driven
Modified as "Separated" G1G2 driven
2004/03Rev 1st stage trouble protectionAdd notum for relay usage
2004/05Mods 6Y6G/GT STC ppSS trial and remodel
2004/06Trial 2SC4029 SS
New 6360, 25CD6-GB SS PP
Power Tr applied final stage
Newly test built
2004/10New 6N7/6N7GT/79 B-PP
New Ebb=30V tube amps
Driver tube driven
Evaluation of low B operation
2005/03New 2SD864k single/PP ampsTrial building
2005/05Mods 2SC4029 SS
Rev Univ STC/Univ SS
Driver changed to 12AU7
Contents re-edited
2005/07New 2SC3486 SS Scale up of 2SC4029 SS
2005/08Rev 2SC4029 SS to 2SC5200 SS Gain adjust/compatibilty check
2005/10New 2SD864K SEPP/Single switchableTrial building
2005/12Rev 2SC4029 SS to 2SC3486 SSDriver condition checking
2006/03New 2SC5200 tube driven E-fol SEPPTrial building
Note: "E-fol" =emitter follower
2006/04Rev/mod 2SC5200 t-driven E-fol SEPPstep by step
2006/10New 2SK3689-01 D-G NFB singleTrial building
2007/01Rev KT88/6550 STCAdd 12E1 etc.
2007/02Reprod 2SC4029 t-driven E-fol SEPPReproducibility test
2007/03New Cross reference table forname of tubes and each amps.
2007/04New Summary for STC amp building(Japanese version only)
2007/06Separated X-tal conv/ Q5'er buildingfrom Mainte of RXs Part 2
2007/07Rev Add cross ref table: 12A6/ 38and 6AH4GT/ 6BQ5(T)/ EL34(T)
Note: "(T)" =Triode connection
2007/08New Horizontal sweeper univ.P-G NFB jointed SRPP driven
2007/09New 6CD6-GA STCAs 2nd Horiz swpr univ.
2007/10Rev Common used power supplies
2007/11Rev Output impedance of ampsAdd DF/two cases
2007/12Rev 6CD6-GA STC/ Cross ref tab.Add 6W6GT etc./ Red triode index
2008/01Mods Horizontal sweeper univ.P-G NF SRPP driven to STC
2008/02Mods 2SC4029/5200 E-fol SEPPDriver triodes replaced
2008/03Mods General description for STC
  configuration related articles
As for protection of
RF osc. on triode-pentode tubes
2008/04Mods 2SC4029/5200 SEPP Replaced IC stages to triodes
2008/06New 2E24 STCNewly built
2008/07Mods 6CD6-GA STC is remodeledto Tube checker univ. STC #2
2008/08New EL34(T)pp Newly built
2008/09New EL509 p-k NFB single
New 41/42/CZ-504-D p-k NFB single
Newly built
Newly built
2008/10Mods Tube checker univ. STC
Mods Super univ. semi-STC
Add 41/42/CZ-504-D operation
2009/01New 7044 p-k NFB singleNewly built
2009/06Mods EL509 p-k NFB singleTrial of FET'ed 1st stage
2009/07Mods Super univ. semi-STCSlight changes with chassis renewal
2009/09Revival of two STC amps6550/KT88 and 6Y6-G_-GT
2010/06New Super univ. p-k NFB singleNewly built
2010/07Mods Trouble protection of STC V1 Add relay simu circuit etc.
2010/11Mods new Triode driven CV18 GG amp Former GG STC driv. to large triode
2011/06New Research into freq converter by triodes~tetrodes~pentodes
2012/07New 6080WC OTL/2SK3689 D-K NFB Both are trial building
2012/09Mods new Two temp. EL34 PP mono From 6550 STC & 6Y6-GT STC
2013/01New 2SD864(k) PP floating OPTTrial building
2013/12Revival 6BQ5 STCFor decoration demo.
2014/06New 6S4-A No NFB singleTrial building
2016/07New 2SK3689 STCTrial building
2017/05Mods Report for STC trialAdd MOSFET version
2018/08New 6CD6-GA UL s (Eb=200V ope.)
Revival as EL34 STC/Holiz. univ. STC
Deleted Super univ. semi-STC
Ep=Eg2 condx. applied to UL conn.
From temp. EL34 PP mono x2
Replaced by S-univ. p-k NFB
以上/EOT