View Full Version : Tubes / Valves
- vdc drop
- HELP - SMART 845 or 300B SE
- DC Servo - Direct Coupling Applications?
- Edison 12 amplifier
- Mounting terminal strips to blank copper board
- 6C33C tube socket for GM70 tube??
- Fisher X100C 2 sets speakers?
- 4P1L DHT Line Stage
- Trying to identify an old radio tube
- Yaqin CD3 upgrading caps help for novice
- push pull adjustable fixed bias
- Another SE amp design.
- Chassis to experiment with....
- Ray Butts Echosonic #27
- Ampeg Reverberocket II Hum
- What coupling capacitor values are common
- Yamamoto A-09s
- 9001 variant of Acorn 954 Pentode
- Khron-Hite UHR220 tube power source
- Grounding the 4ohm tap
- Rectifier mechanical buzz
- Informed opinion(s) on phase inversion?
- Computer grade electrolytics
- Strange problem with Grundig CS200 tube receiver
- Puresound P10 RIAA
- Need help on DIY Toccata Phono Preamp
- Single 6EB8 tube kit?
- SE OPT as PS choke
- Best input DHT tube?
- Stainless Steel Chassis Polishing
- Hm, which order to replace 2 out of 4 tubes?
- EL34 Musical Machine Output XFMR suggestions
- Driver stage to finals newbie questions - (I hope not dumb questions)
- Preamp with single 12ax7 Ecc83 for stereo?
- Ming-Da MC-300B845 schematic needed
- My RH84 Build - first amp after a 25 year break -:)
- Jolida 502a Snubber Mod
- Again
- KT120, PSE
- 6v6 bias with cathodyne
- How did the "magic eye" work on old valve radios ?
- High voltage switching
- High voltage switching
- EF184 as ccs / design questions / spice model
- ECC807
- Chassis thickness
- Compactron 6C10 & 6Q11/6K11 tube data
- Output voltage guitar preamp
- Reverse Engineering leads from Tube amp
- Did you all see this??
- WESTREX 60 WATT AMP
- Johari's audio system
- el95 single ended amp project needs help with preamp
- SS Rectifers and Zero-Crossing Distortion, possible fix or idotic idea?
- 3 ways active crossover
- 5691 tube tonal balance
- Dynaco Mark III chassis
- variac - breadboard with choke input
- Stancor A-8053 Output Transformer - opinions wanted!
- Nice OPT's for headphone amp...
- Eimac 304TH anode question
- Is WE310A > 45 > 300B PP possible?
- Aikido 5687 PCB - Headphone and C3
- Twist-lok caps?
- Tube RIAA(something easy)
- Testing power pentodes
- NTC THERMISTOR as SOFT START for TUBES
- NEW ARIA (MENG) MINI 6P1
- Basic schematic for Dodd Audio tube buffer?
- EL844
- 3 channel all tube preamp pedal w/fx loops for all clone build
- Tube CAD?
- Cap Problem with philco 49-1401
- Music Angel
- Help 7189A Tubes!
- Bulb in cathode?
- Gain and volume pots - newbie question
- Resistor test TX7525 AMRG CMF55
- I think I made a mistake
- 12at7 and 12au7
- PSE KT88 using Mikael's basic schematic.....
- PSU sanity check - negative rail?
- Mods Tube Amps/Pre-amp
- Help to find out what OPT are these
- LL1660 P PZ Lundahl interstage ringing problem GM70pp
- Possible PS chokes
- Adding Bal output to Akido
- Input impedance, the higher the better or not?
- Risk of DC coupled input with tube pre-amp ?
- UL Cascode phono
- DC Imbalance with the LTP
- More Wireless World articles archived
- Yaqin VK-2100 Static from one channel
- Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
- Testing a 300A on a B&K
- Diodes to tube
- PL84/EL86 push pull
- circuit diagram
- Ultralinear operation
- 60hz hum in component system
- Crackling Amp
- Regulated Supply for Direct Coupled Amp
- Explanation wanted
- Dynaco FM1 stereo updating ?
- tube amp diy off. Is this a good deal?
- SE driver
- DN2540 + LM317 cascode CCS?
- Recapping old tube amp
- How a SRPP stage sounds like?
- Help troubleshooting SE Pentode amp
- What meter for Bias?
- Mains tranformer noise
- Tube tester block diagram
- got a custom 829b amp that i got laying around, need to know what driver to use
- Universal filament regulator
- ECC88 - 6DJ8 Cascode Plate Curves
- Gain of Phase Inverter
- CF/CCS, can it be made simpler?
- 2A3 Heater Hum Pot
- Need help - black out while the amp. was on
- simple question about cathodyne PI
- Where can I get a cover for the OPT and PS
- Power supply for heater
- how to use oscilloscope
- I am collecting parts for my 200w mono amps "But"
- This seems wrong?
- StoetKit Junior Schematics
- Valve Amplifiers 3rd edition Errata
- Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
- 6v6 datasheet
- Leaving filaments on?
- output caps -- your observations, pleeze
- Low gain preamp.
- Recommended Tube/Valve references?
- Stand Alone guitar power amp
- Tube Socket Identification
- Some agreement on reasonable affordable and well performing design builds?
- Fletcher cooke OTL article
- I have 4 Pl504's. Are they best used as SE or PP ?
- More k12g amp musings
- How preserve loudness circuit with new volume pot?
- Where to find 212E tubes???
- Music Angel XD-SE EL34 Amp
- CV345 VS EL34
- Reducing Filment Hum in Tubes
- push pull power amp
- 6 ohm speakers....
- Need a 12.6 VDC power supply schematic
- Gold Lion KT88 Issue
- Plate currents in P-P
- Bass preamp + Edcor balanced out = HUM!
- Testing amplifiers with computer software...
- Welborn Labs - Abysmal Service
- Repairing broken pins on valuable tube...
- Explain how feedback affects DF?
- Low emissions
- Tube Blue Glow question
- Common-mode choke before or after?
- 6l6 data sheet question
- Mic preamp
- Physical Tube Diagnosis?
- how and why power amps clip
- 80's Guitar Amp...replacing o/p tubes...which 6L6 should i try?
- Vacuum Tube OTL power amp!!
- Tube replacement options.....
- balanced RIAA amp
- power amp distortion
- Suggestions for 5k5 40W iron?
- Peavey Classic 30 Reverb headscratcher...
- Schematic Tube Analog Output Stage???
- 300B 'direct drive' using a 6U8..
- Magnavox 88-02 power trans ratings?
- Preamp with humming noise!
- How to choose line out transformer?
- Tools for Cutting Tube Socket Holes?
- Switchable SE.
- GZ33 in place of 5U4 can it be done?
- phase splitter issue
- Armstrong A10 MK2 EL34 mono block
- "Ug" The Transformer
- i think its time i start playing with caps
- problems with preamp on home brew
- LS180 Tube Socket?
- simple question - 5V heater power supply
- Lineamp
- FI AUDİO 421 A
- Pete Millett has another Red Board for sale
- Jolida JD9 Problem
- 6N11 = 6N1P ?
- K12-G tube amp problem
- Please vote for one of the schematics.
- Advantages of separate PS for input and output stages
- Another PCB tube amp design
- Help. Replacement OPT sqrueeechhh.
- New concept of a power amp
- Lundahl and rectifier mismatch?
- Resurrecting weak tubes
- Best DHT heater?
- Help requested for EL84 SET amp
- What did I buy??
- Edcor and Custom Power Transformer Design
- What would you make with this power TX?
- Lundahl 1676
- DHT for 300B problem
- Newbie question about output transformer to speaker matching
- Red board add-on phono/RIAA pre-amp
- 2 Chassis amp
- Is It posible to bridge two quad II monoblocks?
- Power tube at work picture
- Tube SE power amp , which one??
- Hickok 539A issue
- Noise in one channel? Pioneer SX-400
- Hartung / Prestla OTL amps
- Lafayette Model 417
- Extreme plate load
- What do you think about this idea
- el84pse schem, need advice
- Video pentodes as outputs
- Custom Vibrolux Reverb noise issue
- Chinese "Audio Research" KT88s
- Fender bandmaster rectifire problem.
- New 6C33 Socket
- 2a3 PP output transformer
- PSU problem - Murphy is an ***hole!
- Best SET design?
- Anybody ever tried EBC41 as 12AX7 substitute?
- The 7242
- 12bh7a
- Phase Splitter Help
- Oscilloscope Question
- sizing opt
- 6P3C-E Datasheet help
- on the toroids again
- OPT problem or Something else 6L6 PP
- Look what I found!
- Help, Diy tube amp
- Idea
- a few DIY tube amplifier setups
- 6L6 PP amp motorboating
- Mayer-inspired 4P1L
- 6L6 WGB 2X34W STEREO AMPL
- Isolation transformation wiring project help
- Tube Amp DIY or Retail
- Supplier for GU50 tubes
- 2E26's
- Encel Stereophonic M.F.B CSM 40 amplifier
- Mono 300B SE Amplifier
- Broken tubes for 3D Modelling
- Loud hum in one channel
- 6EM7 PP question