Greetings!! First time poster, long time lurker.
My first build is not passing sound. Ceriatone tweedle dee kit, stock parts, known working preamp tubes. I used the bulb limiter on first power up and it all seemed good. I tried bypassing the input Jack thinking I had messed that up, but no luck.
V1. 183.4, 0, 0, 3.36, 3.36, 179.1, 0.61, 1.2, 3.36
V2. 197.4, 0, 0, 3.36, 3.36, 259.6, 19.2, 45.4, 3.36
V3. 22.7, 3.36, 407.2, 354.8, 0, 0, 3.36, 22.7
V4. 22.7, 3.36, 406.8, 354.5, 0, 0, 3.36, 22.7
V5. 7.1, 0, 0, 132.5, 336.8, 132.6, 337.5, 4.9 all ac.
Otct. 412dc
All voltages were taken pin to chassis. I am getting some pops when i probe V2 and V3 and V4 but nothing on V1. Will attach photos also.
Any help will be greatly appreciated. I've already learned so much from this forum...many thanks
Tweedle dee debug help
Moderators: pompeiisneaks, Colossal
-
Crschmidt1111
- Posts: 4
- Joined: Sun Oct 13, 2019 8:22 pm
Tweedle dee debug help
You do not have the required permissions to view the files attached to this post.
-
wpaulvogel
- Posts: 448
- Joined: Wed Jan 23, 2019 3:11 am
- Location: Leesburg Georgia
- Contact:
Re: Tweedle dee debug help
The first thing I see is that your solder on the eyelet board is lean. You need to add more solder and fill the connections. I’m also seeing in your voltage that the cathode voltage on a few terminals is 0 volts. 0 volts is not possible when this circuit is working properly. Either the measurement is inaccurate or the circuit is faulty from component or soldering. The amp should still output sound with 0 volt cathode voltage but investigate the voltage.
- martin manning
- Posts: 14308
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: Tweedle dee debug help
Pins 1 and 6 on V1 and pin 1 on V2a (plates) look reasonable, but that doesn't square with the pin 3 and 7 on V1 and pin 3 on V2a. Maybe measurement error?Crschmidt1111 wrote: ↑Sun May 22, 2022 8:57 pm V1. 183.4, 0, 0,(should be ~1.2) 3.36, 3.36, 179.1, 0.61,(should be 0) 1.2, 3.36
V2. 197.4, 0, 0,(should be ~1.2) 3.36, 3.36, 259.6, 19.2, 45.4, 3.36
V3. 22.7, 3.36, 407.2, 354.8, 0, 0, 3.36, 22.7
V4. 22.7, 3.36, 406.8, 354.5, 0, 0, 3.36, 22.7
V5. 7.1, 0, 0, 132.5, 336.8, 132.6, 337.5, 4.9 all ac. Pins 2 and 8 should read ~412 DC, pins 4 and 6 should read ~338 AC. 1,3,5, and 7 are not used.
Otct. 412dc
-
Crschmidt1111
- Posts: 4
- Joined: Sun Oct 13, 2019 8:22 pm
Re: Tweedle dee debug help
Will re measure very soon and get back. Thank you
-
Crschmidt1111
- Posts: 4
- Joined: Sun Oct 13, 2019 8:22 pm
Re: Tweedle dee debug help
Re measured
V1. 183.4, 0, 1.28, 3.36, 3.36, 179.8, 0, 1.2, 3.36
V2. 197.4, 0, 1.6, 3.36, 3.36, 259.6, 19.2, 45.4, 3.36
V5. 0, 415, 0, 133, 335, 133, 335, 414.3
I've got 335 ac on pins 5 and 7. According to my layout that's where the transformer wires get connected. Pins 4 and 6 have 133 ac which I'm guessing has to do with the diode connecting 4 and 5 and again 6 and 7.
I was measuring AC before. Not sure why I thought that was correct. All measurements are DC.
Also,
I checked continuity on every solder joint as i went but I will go back over the eyelet board and fill em up.
V1. 183.4, 0, 1.28, 3.36, 3.36, 179.8, 0, 1.2, 3.36
V2. 197.4, 0, 1.6, 3.36, 3.36, 259.6, 19.2, 45.4, 3.36
V5. 0, 415, 0, 133, 335, 133, 335, 414.3
I've got 335 ac on pins 5 and 7. According to my layout that's where the transformer wires get connected. Pins 4 and 6 have 133 ac which I'm guessing has to do with the diode connecting 4 and 5 and again 6 and 7.
I was measuring AC before. Not sure why I thought that was correct. All measurements are DC.
Also,
I checked continuity on every solder joint as i went but I will go back over the eyelet board and fill em up.
Re: Tweedle dee debug help
are both output (speaker) jacks shorting type?
Jack Briggs
Briggs Guitars
Briggs Guitars
Re: Tweedle dee debug help
Agreed! There are several eyelets that appear to have no solder or very little solder. The whole eyelet should be filled with solder. You can measure voltage until the cows come home. If there is no continuity at the various eyelets, the signal won't go through! You say no pops on V1. I'm not surprised. It looks like the two eyelets with 68K resistors and blue wire have no solder at all.wpaulvogel wrote: ↑Sun May 22, 2022 10:18 pm The first thing I see is that your solder on the eyelet board is lean. You need to add more solder and fill the connections.
-
Crschmidt1111
- Posts: 4
- Joined: Sun Oct 13, 2019 8:22 pm
2 others liked this
Re: Tweedle dee debug help
After reflowing the eyelet board and re wiring shielded cable from volume pot to v2....I have a working amplifier! Thanks for the help and replies all. Any further comments on voltages, lead dress, or anything are welcome and appreciated.