Search found 125 matches
- Wed Nov 03, 2021 1:26 am
- Forum: Technical Discussion
- Topic: Is Classictone transformers kaput?!
- Replies: 9
- Views: 1174
Re: Is Classictone transformers kaput?!
Other than Mercury Magnetics & Edcor, who else is supplying transformers?
- Tue Nov 02, 2021 8:20 pm
- Forum: Technical Discussion
- Topic: Is Classictone transformers kaput?!
- Replies: 9
- Views: 1174
Is Classictone transformers kaput?!
I haven't been on the site for a while and just clicked on my bookmarked link and to my dismay it looks look Classictone is no more - say it ain't so!
- Sun Jul 14, 2019 11:45 am
- Forum: Technical Discussion
- Topic: Output trans impedance for KT88
- Replies: 3
- Views: 2180
Output trans impedance for KT88
Thinking about building a low wattage (5-10 watts) single-ended amp using a KT88. What is the preferred Output transformer impedance for that power tube?
- Fri Nov 16, 2018 2:29 am
- Forum: Technical Discussion
- Topic: Where to insert preamp bias-vary tremolo?
- Replies: 16
- Views: 1473
Re: Where to insert preamp bias-vary tremolo?
Using a new production Tungsol. Got a socket adapter on the way to plop-in a 12AX7. If that doesn't do it for me I'll try that circuit sluckey used on his Jet.
- Wed Nov 14, 2018 8:00 pm
- Forum: Technical Discussion
- Topic: Where to insert preamp bias-vary tremolo?
- Replies: 16
- Views: 1473
Re: Where to insert preamp bias-vary tremolo?
Isn't that where the audio signal comes into the trem circuit from the preamp? Disregard that question. Disconnecting the intensity pot from V2a pin 3 would shut off the tremolo completely, no? Would changing the values of the Intensity pot (50K) and/or the 68K resistor that connects the Intensity ...
- Tue Nov 13, 2018 10:08 pm
- Forum: Technical Discussion
- Topic: Where to insert preamp bias-vary tremolo?
- Replies: 16
- Views: 1473
Re: Where to insert preamp bias-vary tremolo?
Disconnect the INT pot from V3A. Does the LED drop out at slow speeds now?
Isn't that where the audio signal comes into the trem circuit from the preamp?I mean V2A.
- Tue Nov 13, 2018 8:58 pm
- Forum: Technical Discussion
- Topic: Where to insert preamp bias-vary tremolo?
- Replies: 16
- Views: 1473
Re: Where to insert preamp bias-vary tremolo?
Do you mean V3b, middle lug of Intensity Pot to V3b cathode via 68K resistor?
Can't use output tube, this amp is cathode biased.
Can't use output tube, this amp is cathode biased.
- Tue Nov 13, 2018 6:17 pm
- Forum: Technical Discussion
- Topic: Where to insert preamp bias-vary tremolo?
- Replies: 16
- Views: 1473
Re: Where to insert preamp bias-vary tremolo?
Tried a diffuse red 5mm (1.74v): Slightly more output but when I slow the speed down oscillation stops. I have to crank up the speed then turn it back down to get it to oscillate at slower speeds - not ideal. Yellow diffuse 3mm (1.85v): A hair better than the red as far as output but still same prob...
- Tue Nov 13, 2018 4:30 pm
- Forum: Technical Discussion
- Topic: Where to insert preamp bias-vary tremolo?
- Replies: 16
- Views: 1473
Re: Where to insert preamp bias-vary tremolo?
Diffuse red or waterbright clear red? Does it matter if it's 5mm or 3mm? 'Cause in some instances size matters.
- Tue Nov 13, 2018 3:01 pm
- Forum: Technical Discussion
- Topic: Where to insert preamp bias-vary tremolo?
- Replies: 16
- Views: 1473
Re: Where to insert preamp bias-vary tremolo?
Yo sluckey, tapped in at V2 pin3 (cathode) and... DISCO! Movin' and a groovin', I have tremolo! Now I would like to increase the intensity of the effect, if possible. The 6SL7, even though 'similar' in gain to a 12AX7, has slightly less gain. Is there a component/s that I can adjust in this circuit ...
- Mon Nov 12, 2018 8:53 pm
- Forum: Technical Discussion
- Topic: Where to insert preamp bias-vary tremolo?
- Replies: 16
- Views: 1473
Where to insert preamp bias-vary tremolo?
Built a single-ended amp with a modified 5E5-A preamp using 6SL7's and was unsure where in the preamp to tap into for a bias-vary tremolo circuit. Any suggestions would be greatly appreciated. Here's the preamp circuit: https://ampgarage.com/forum/download/file.php?mode=view&id=52313&sid=436dc5aa803...
- Wed Jul 18, 2018 12:56 am
- Forum: Technical Discussion
- Topic: Treble pot squeal
- Replies: 5
- Views: 2248
Re: Treble pot squeal
Ahh, let me clarify: The Normal/Bright Volume pots turned up diminishes the squeal of the Treble pot at the 2/3 rotation and beyond. There is no squeal at all in the Volume adjustments with the Treble pot at the 12 noon setting. Also, this is not a new build. It has been running trouble free for a y...
- Tue Jul 17, 2018 7:14 pm
- Forum: Technical Discussion
- Topic: Treble pot squeal
- Replies: 5
- Views: 2248
Re: Treble pot squeal
Thanks for the quick reply! In the meantime, I adjusted my mixing resistor values to address a discrepancy in Volume output differences between Normal Volume and Bright Volume - went from 270K each as in 5E5-A schemo to 220K Normal & 330K Bright which evened the levels out a bit but still Bright cha...
- Tue Jul 17, 2018 5:40 pm
- Forum: Technical Discussion
- Topic: Treble pot squeal
- Replies: 5
- Views: 2248
Treble pot squeal
I built a single-ended amp with a preamp based on a Fender tweed 5E5-A. Normal & Bright Volume control and the standard Treble & Bass control (500k pots each) cathode follower tone stack. I'm having an issue with a pronounced squeal on my Treble pot when rotating it to 2/3 and past til full rotation...
- Thu Nov 17, 2016 6:15 pm
- Forum: Technical Discussion
- Topic: Power/Standby switch Q - '74 Super Lead 100 mk2
- Replies: 0
- Views: 7125
Power/Standby switch Q - '74 Super Lead 100 mk2
A friend dropped off a Super Lead 100 mk2 for me to work on - replace & install new electrolytics, new power tubes (matched quad JJ El-34's), and re-bias. Also he had an issue with the old power & standby switches: the amp had developed an intermittent drop out of volume when playing the amp and not...