- Passive RIAA and cap variation
- 6T9 push pull with Cathode Coupled input
- mixed bias
- Need help: tube DAC and Phono pre-amp
- Feedback equation
- Lafayette PA 675 Schematic ?
- phono preamp?
- Input tube recommendations...
- blind test tube preamp free for all
- Estimate Miller of Triode Strapped Pentode
- Tube Care for Prolonged Life
- bias resistor to use for a PP 300B?
- 12AY7 preamp schematic
- visio shapes
- vt25 in pre amp
- Wire Wound Pontentiometers - resistors
- Sound City B120
- Single supply 6922 buffer with 2SK CCS
- Aikido and 30W Class AB power buffer?
- Simple Pentode driver for a 45 ?
- Sennheiser HD 650 Question
- ampeg svt 2 pro preamp problem
- Edcor specs?
- hook up wire
- 6X5, 2x 6SL7 & a 6v6GT....
- strange tube? E-8128
- Value of grid-leak resistor
- TubeTech Valves
- 1st build done.
- Tube socket does not fit tube
- 300B SET Bias Help
- This Connector for an Amp Umbilical?
- Chassis Grounding and rectifiers
- TechTube TM Blackburn status
- Protection of tubes/amp...
- 6sf5
- EF86 - Interstage transformer - EL84 PP AB
- Schadeode
- High-power amplifier using transmitting tubes
- Basic testing/meter question
- Mains voltage change for Sonic Frontiers SFS80 ?
- transformer unused secondary noobie question
- Acrosound High Power Williamson - HELP!!!!
- 300B Cathode Feedback + Cathode Bias
- "Budget" GM70 SET
- Chokes next to output transformers?
- Adding more power tubes and make a tube amp switching them?
- 1. time biasing...
- SE solution wanted
- tube rectifier
- Baldwin amp, yet another amp conversion project
- sorry, yet another newbie - what can I make with these???
- Design Help (load line) on a SE Mono Block Amp build
- Plate Choke SRPP…. What do think?
- Looking for a Fisher chassis 51 mono amp
- Majestic Transformers
- Inverted Mos HV soft start
- Strange S5 K-16LS oscilloscope readings
- Why don't pentodes require aligned grids?
- First design for a tube noob
- Newbie and ASL Wave 8 problems
- Evil Experiments - Hammond Paper in Oil Caps
- Now I know what this Tranny can do
- Pinnacle tubes??
- First Project.... and Hello
- VTL Integrator schematic
- Old transformators...
- 12AU7/12AT7/12AX7 preamp schmatic needed
- Booz preamp
- Mystery "The Fisher" console mono amp
- Cracks and hiss in tube guitar amp
- Voltage Doubler
- Gas Reference Tube (5651/85A1/etc) Internal Impedance
- Sakuma-San Pilgramage?
- Any HP 8903 audio analyzer owners?
- xL508/6KW6/17KW6
- 6C45 phono input only?
- Initial Thoughts for "Mr. Piggy" SE Amp w/Screen Driven 6P45S
- Switch box using VR glow tubes
- Ideas for a simple 6080/6AS7 Push-Pull amplifier
- TJ 845 Tubes
- Looking for a web tutorial on basic calculations
- Berman linestage- do I reference heaters or not?!
- calculating gain
- Simple EL84 amp...
- Tube Direct Box - Got design?
- Raphaelite Audio Transformers & Sino Tube Amplifier Kits - What's your experience ?
- S-5 Electronics K-16LS & 6V6 Substitution
- how to calculate current requirement
- Stancor Transformer Data Sheet Needed
- 6BL7 replecement
- Toroid PT question
- New SET Amp
- What do you guys think..
- Output Stage in MJ Question
- Input voltage on an integrated tube amp
- 6sf5 = 1/2 12ax7?
- Observations of amplifier sound
- Sovtek KT88
- 24 or 24a as driver in 2 stage..?
- Too high transformator voltages...
- This power supply ok?
- 300B valves
- Modulation transformer for a driver transformer?
- Is 6V DC too low for heater filament?
- mundorff 0.47 silver in oil
- need manual for heathkit sp2
- Interresting Quiz. Which tube is this?
- el84 burn in time ?
- Tube Amp Compensation Q
- Quad II Advice
- Bias problem- 1 Socket shows extremely low bias!
- ECC88 vs E88CC
- Finally, back to my Simple SE project
- can trafo laminations rest on chassis?
- Ping Poindexter - 6SN7 Moebius Linestage Question
- More information wanted on this Phase Splitter Circuit
- Converting tube tester to Mutual Conductance
- 6UA4-GTA Question
- oscilloscope turned guitar amp?
- LED cathode bias - how to pick LED?
- preamp question
- Hickok tube tester calibration help needed
- Watch this !
- any Welborne Labs Ultrapath owners ?
- McIntosh transformer turns ratio
- 12E1 & S11E12 as a KT88 substitution
- Dynaco ST-70 Triode Conversion Techniques
- Larry Moore power supply
- SE to Balanced tube preamp idea
- Help on Cascode DN2540 CCS
- Kt88 Pp
- What was the diy world like before the internet?
- Updated my website
- Marshall AVT 50 preamp gain/distortion increase
- Interstage question in 6ac5G design
- Using a powered sub with my tube amp
- 807pp suggestions and guidance please
- 2 stage IT coupled SE suggestions.?
- WE429A similar to 6V6?
- 6FQ7 in RH84
- Deluxe Reverb Re-Issue High Frequency Noise.
- What splitter for this design ?
- preamp kit?
- PP power supply design questions
- Hammond 1650P for KT88 PP - any experience?
- Gibson tube amp mod for JAZZ
- Cathode Bypass caps - how to choose?
- Marantz 9 output power switch
- Single ended KT88 question
- Anyone Have a Hickok 800A
- Please post your experience with 6C45 and 6H30
- Series-Shunt Regulator I need
- Hammond Gripe
- capacitors in series- what value balancing resistors?
- Substituting Pentode for Triode
- Pentode Driver Calculations
- DHT and speed issues
- Aikido vibration issue
- Modified Salas Mosfet Shunt Reg
- What if O.H. Schade had MOSFETs?
- Please Look at my circuit
- EL34 tube amp that needs work on
- question on differential stage
- Need help with my ST70, decrease in one channel
- Diff drive
- Stereo Aikido GND help
- Hashimoto HL-20K-6 Line Output Transformers
- What is the RIGHT way to calculate the Value of the cathode resistor?
- Kt88 Se
- ping Tom Schlangen
- Found An Old Transformer, Now What???
- Brook 22A restoration, HELP!!
- Optimal operating point for 7N7/6SN7?
- Loudness Control Calc - Help Please
- Kofi Annan in: "Cascodin' with Steve Bench's RIAA!"
- New 300B PP amp completed, phase shift questions
- One more PSU2 question
- 5U4 Darling power TX advice needed
- how to optimize this pentode PP (PP1 clone with S11E12)
- Can I change the input to a 6SL7?
- Outputtransformer to IGA 6550C ULPP
- Question on use PSUD2 software
- Please add to my confusion re stepup transformers
- filament power supply question
- Major Hum Problem
- FARMER LAMP amp
- Valve amp "master class"
- Toroid power transformers - are they a good idea?
- EL84 SE amplifier
- Gain Problems
- My SE KT-88 Build thread
- Rolling da(rling's) 6j4wa
- Phono pre amp
- Michealson Audio Da Vinci Preamp
- Acrosound PP 6550: Any Advice?
- PS idea: isolating transformer from load
- K-16LS Help Please
- 6N6P-I life-time
- Filament Xformer woes...
- The Use of 1:1 Input Transformers in Linestages
- 12hg7 vs 12hn7a
- Anyone familiar with VAC PA 90C1?
- Help restore an RCP 413 tube tester
- voltage reg make heat sink live. Bad idea?
- Audio Innovations series 800 reactivation + some mods
- Using 2 rectifiers off 1 power supply
- Tube power supply
- Improving low bass of a Scott 299c
- 1939 Radioshack Catalog online...Anyone have a time machine?
- VCCS filament supply for 813
- digital volume control
- Philips AD3800AM and AD9710AM clones
- MTP6N60E replacement
- Upgrading output transformers
- Cascode RIAA
- need a manual for selectron model 40 tube tester??
- Volume swinging problem
- How to use the almost Group buy Diyaudio CCS circuit
- Big voltage swing tube recommendation please
- Morgan Jones KT88 PP
- Mystery Tube Amplifier -- Help?????
- tube tester how can i tell if have match pair?
- Photo flash caps for the power supply?
- Finding bias point in PP fixed bias
- 6V6 Push Pull
- Transformer Mounting Braces
- Rozenblit 6as7 otl questions
- Genesis pre-amplifier schematic wanted
- 6H30PI/6922 Preamp Circuit
- PFB line amp
- 2A3C Mono plate: Shuguang Or Sovtek?
- Any kit reccomendation would be helpful
- Cleaning tubes...
- Anyone recognise these tubes...
- big ol' 26lb. output transformer...
- ECC88 Help
- European Triode Festival ETF08: still some places vacant!
- Dynaco MK IV Mystery
- 6as7/6080 Se Otl
- 6GW8 substitute tube 6BM8?
- Choke question
- Screen driven output stage
- Peavey Delta Blues Reverb Frustration
- 2a3 parallel driven 6sn7 schem
- WMD or Big Freakin Power Supply
- DIY My tube tester
- Help! May have dropped 12sn7 in place of 6sn7
- Got a bucketload of tubes, need identification
- Help from Allen Wright SuperReg owner