View Full Version : Tubes / Valves
- How to balance pushp pull DHT finals
- 240v to 220v
- Hammond 272 FX plate voltage
- Drawing Load Line for Parallel Output Tube
- question about swapping el34 for kt77 in my tube amp
- 6 volt recifier tubes
- PSU Capacitor Selection
- Output transformer sizing...again...
- Power supply cabling
- Voltage doubler using PSUII?
- Rectifier Tubes in SE Amps
- 6v6 SEP
- 1967 Pioneer SX-34, 11W, WORTH FIXING???
- Jumper Wire Gauge and Material for Phono Preamp?
- Tube libraries for AutoTRAX wanted.
- DIY Layout Creator for Chassis Designs
- ecc99 - 6C19n PP, (6S19P)
- Dr Z Carmen Ghia build from a Hammond Reverb amp!!
- Strange HF distortion
- have a pair of 5k:8 OPTs lying around.. suggest me something to build?
- Marshall 1959 (Super Tremolo) repair help
- Early history of High Fidelity amplifiers
- Which pentode for input?
- 6n6p or 6P14P-ev for driver
- Old tranny - confused with windings
- Dynaco A-430 Vintage Output Transformers
- Output tube for 800 Ohm speaker?
- Today was the anual Tree Street Yard Sale event
- Florida ? what did I get ?
- 26HU5's vs 26DQ5's
- VoltCraft AT-400?
- Sonic differences: 45, 2A3, 300B, 845, 211
- Need help wiring a pot for cathode adjustment
- Sound of the 6SN7?
- A mystery device
- Plate curves... Ic2 & Ib?
- How to choke load for big voltage swings?
- 6550 SE design, please comment.
- "Impedance" of the output transformer
- Triode-wired small signal pentode question
- Calculating output impedance
- 6JM6 Infomation for Pete Millett's DCPP Amp
- Tube labeld ETBB
- Heaters wiring help!
- What do you guys think of this IR volume control?
- Can you send me the Aikido 5687 user manual
- Cathode Follower output cap
- EL84 rebuild suggestions
- voltage divider in WE91 driver
- Power Tx Myth?
- voltage multiplier based on SS trafo - LONG
- What tube for QUIET phono pre??
- A&R 8ohm 4008 output transformer
- How does DRD Ultrapath Work?
- Russian 6H2p-E??
- Started work on my stereo 7027a PSE amp
- Mono Tube Comp for analog kick drum
- Line stage preamplifier
- Trying to select the Aikido components
- X-PRE musical fidelity preamp. need help modifying
- 6C33C & Borbely Question
- 12BH7A in common cathode
- Sneak Preview: 9 Band Active All Tube EQ
- Bought a set of Greenlee conduit punches for my latest project - WOW!
- "Universal" octal amplifier?
- MU follower - distortion
- lighting transformers 12V
- Chinese 6N3 preamp questions
- Why are Chinese preamp knockoffs so popular?
- 4K7 OPT suitable for 6550/KT88?
- Transformer question - 110 v and 25 v from 1 secondary?
- About loadline again, how to choose load and current
- Parallel Output Transformers
- 6SN7 / 6V6 power amp : very odd behavour
- HV mA Spec on Large RCA Power Xfmr?
- Is the Aikido too 'bright'?
- Has anyone put the Glassware phono & line amps in same box?
- High impedance balanced output: how long the cable?
- Data Sheets
- Can I use a LM317 bias on lower cathode of SRPP?
- AU-34 Output transformer replacement question
- The new KT120 from tungsol
- em83 questions
- Push-pull PCL84 schematic and a question
- confused on power transformer ratings
- C3g:GM70:GM70 schematic advice
- Can someone explain Load Lines?
- Humming from WCF but not SRPP
- Gas regulator tubes
- My B&K 707 sensitivity seems wonky
- Lowrey LC1 B schematic wanted
- Complete tube amp novice got a few questions!!
- jacked up the bias...WOW!
- Looking for PP 7027a shematic
- So, if it's not DIY Gene, then what?
- What driver tube for 200Vrms?
- Tube socket purchase
- Something I found interesting a while ago!
- Eico HF-22 Circuit
- SEDHT amp - decisions decisions
- Confused with designing
- Digitally controlled analog attenuator
- Purchased my 1st valve amp and can only get one channel working, please help!
- Another silly tube yesting question
- potentially very stupid questions....
- Tube rectifier: AZ1, AZ31, AZ50 vs 5u4
- Tube Square-Law, what and how to set up?
- Need help finding schematic. Conn 720
- OPT for parafeed SE
- Anyone else tried an opamp as a driver?
- e180f/6688 pentode operting points
- power supply reassignment problem
- Mains power transformer on S5 K-12 kit hums?
- Oriole OPT
- 26DQ5's vs 26HU5's vs 6KN6's and transformers
- SRPP power using power tranny as OPT?
- Need guidance with heathkit SA-2 refurbish/mods
- B+ discharge times!
- 26HU5's....and a confession
- Bell Sound Systems Pacemaker Model 2220
- Any thoughts on this transformer on eBay?
- Need some help figuring out a Wurlitzer 6240.
- Bypassing cathode resistor on pp power tube
- Is it safe to use a 8BQ5 in place of a 6BQ5 in a guitar amp?
- TRIODE Voltage amp + Power OP output follower
- Cats and tube-a-holics
- Replace Tube Rectifier With Weber CC?
- 717a 2 stage SE amplifier
- Thoughts on Oatley K282 Valve Preamp?
- SS rectifier for SimpleSE and others...
- Need match Pr KT-88
- EL34 PP - again !!!
- S5 K-12 Kit sounds excellent with iPod, but relatively low volume with turntable?
- Finished K-12 Kit with cedar / brass chassis (pics)
- Groove Tube Dual 75 schematics
- Tubes HOT!
- Meng volume pot problem
- Use P-P OPT for SE?
- Safety ?
- Film caps always better than lytics?
- Valve Preamp for voice / guitar purpose
- 851 set?
- dual cathode follower problem
- Question about connecting grounds
- Is it okay for capacitors to be close to the main power transformer in S5 K-12 Kit?
- Fisher 500C Schematic
- looking for PP 6l6 schematic
- Muiscal Paradise MP-301 6V6 amp.
- First Build - PS Voltage Question?
- Need help about an hybrid amp circuit
- Radio to guitaramp conversion hum problem
- Pioneer SX-348 - Service manual?
- Tube PS for mic preamp Help
- Add rectifier tube to yaqin mc10l? What size is best?
- global negative feedback schematic
- Signal transformer question
- What speaker system for tube amplifier
- 39/44 Tube
- tube-aholics anonymous ?
- 12AX7 heaters from 9VAC transformer
- Cant stop Aikido Humming
- Suggestions for rotary switches
- Question about potential transformer placement in K-12 Kit
- Extra pins on replacement potentiometer for K-12 tube kit?
- Instrument tube / valve preamp
- SRPP - issues understanding how to increase current
- ARC Power source+Marantz 7C（PCB edition）
- Repair and adjustment tips
- trimax output transformer TA2444
- anyone recognize this valve?
- Microphone Preamp design
- 6CM5 hi-fi amplifier
- Building an amp try #2
- Can the 6S33S/6C33C be mounted horizontally?
- A heptode question
- Looking for a 807 amp with 4 pairs of 807's
- pp output transformer miniblok2
- John Swenson's BDT preamp - finally!!
- Voice of Music console 816
- Steve Bench 1 tube reg in all glass
- Conn Caprice 427 needs new 12AU7 tubesadvice?
- Position of Iron in Can of HK Citation II Output Transformers
- Bottle size,does it matter in matched quads?
- Heater Pots?
- Current calculation from datasheet
- Any one ever seen this amp?
- Guiguang 300B for 300Beast.....
- FLEA PPP, all ecc99
- Well, it is time to start thinking about winter projects. GM70
- aghhh is my tube okay?
- Grid Bias provided by transformer secondary winding, what is this stuff about?
- Zener regulated supplies
- OPT fore drive ribbon speaker directly; why not ?
- van Dorn's Octode design - recommendations for a 10W/ch version
- Outrageous Speaker/Amplifier Idea
- Anyone ever made the EL84 P-P circuit referenced on the Tubecad Journal site?
- Scratchy volume pot on TAD DIY deluxe reverb
- Cathode Follower ideas please.....
- Anyone used the NTE1866 VU LED driver?
- Any potential problems when using a combo potentiometer / power switch on a K-12 kit?
- Help needed understanding component values.
- Separate passive pre and monoblocks?
- My new diy site
- Valves and musical instruments
- My DC Darling
- Question - add LED power indicator to Aikido pre
- Colorful amps
- Aikido Cathode Follower
- Converting a dirty channel to clean?
- A few questions about transformer placement in an S5 K-12 tube amplifer
- Bogen AP30 and new member
- Adding Clean channel to AX84 P1-Ex
- Echocord Super 62 Feedback at Low Levels?
- Direct Coupled 76/5687 linestage
- Be kind to your 5AR4 and input capacitor
- New Self-Powered ROHS compliant electronic device invented!
- Making my first hifi tube amp.
- Variation on Rodīs bias servo
- "No Light District" P-P amplifier
- What kind of tubes do i have?
- Understanding Scope Trace Square Wave
- Single tube SE with EML-20B
- LED bias cathodyne
- Diagnosing hum???
- Posted tube microphone preamp design
- Finally put the Aikido in a proper chassis
- Tube Preamp / Headphone amp question...
- Phono Preamp
- Initial 'DQ5' testing
- Free Tube Amplifier Schematic Diagrams
- Testing with DMM
- The Impressive Vetruvio GM70 SET amp.
- Fender Twin Reverb channel 2 has no output
- 6sn7 subminature??
- One channel louder than other
- How to use RCP 802A tube tester test B9A tubes?
- phono amp question - adding input tx
- Ebay "clones" PCB
- Phase splitter and balance input
- At Last....First Build Complete...6V6/6SL7
- Amplifier input
- The Tube Maze
- Variable Harmonizer
- Vetruvio Audio; new competition for the Chinese?
- Transmitting tube-driven transmitting tube SET amp?
- Circlotron questions
- Home Grown tube amps
- LT108 Oscillation sounds like tube rush/white noise
- Cool looking tubes anyone...
- st70 standby switch/cathode stripping SS rect