Brett
Well-known member
Thank you for clarifying, @vigilante398! I do hope that you continue to offer these types of projects for DIY and that the root cause(s) of the oscillation are determined.
Space Heater. TUBES!
- Thread starter Dan0h
- Start date
Dan0h
Well-known member
Ok, so I swapped in a TLC555 chip and I know it doesn’t make sense but the pedal seems louder! I know it was loud to begin with but maybe this chip is pushing slightly higher voltage to the tube?
Either way it’s louder and bigger sounding. I think I will stick with the TLC555 vs the Ne555. The odd part is now if I don’t have the buffer in front I get squeal on higher level and higher gain settings. With buffer In Front zero squeal but when I max the gain I get that weird robot squeal but I really think it’s due to the tube not handling that much gain. On the Ne555 chip I had no squeal even without buffer but still had the robot squeal at max grain. Space Heater. My black eye squeals with out buffer on high no squeal at all even maxed after buffer. Also, still can’t have both of these on the same board. All sorts of weird noises when they are both in the same chain even if only one is engaged at a time.
The whole buffer thing should help the gurus that understand this stuff better than me find the cure. I’ll be rocking with buffer in front for sure and only using one on the board at a time. I like them both so much for now I will have to just swap them as needed.
I’ll have to get out the DMM and check voltages on the pins tomorrow to see if it’s my ears or if the tube is getting just a smidge more volts with the TLC555.
Either way it’s louder and bigger sounding. I think I will stick with the TLC555 vs the Ne555. The odd part is now if I don’t have the buffer in front I get squeal on higher level and higher gain settings. With buffer In Front zero squeal but when I max the gain I get that weird robot squeal but I really think it’s due to the tube not handling that much gain. On the Ne555 chip I had no squeal even without buffer but still had the robot squeal at max grain. Space Heater. My black eye squeals with out buffer on high no squeal at all even maxed after buffer. Also, still can’t have both of these on the same board. All sorts of weird noises when they are both in the same chain even if only one is engaged at a time.
The whole buffer thing should help the gurus that understand this stuff better than me find the cure. I’ll be rocking with buffer in front for sure and only using one on the board at a time. I like them both so much for now I will have to just swap them as needed.
I’ll have to get out the DMM and check voltages on the pins tomorrow to see if it’s my ears or if the tube is getting just a smidge more volts with the TLC555.
Last edited:
Dan0h
Well-known member
@vigilante398 i would like to add a pull down resistor on the output of the Space heater to hopefully solve the FS popping. Best spot to connect it? On the out tip line to ground? I see the black eye basically has one but the space heater goes direct from that 600v cap to output. Thank you for any advice.
vigilante398
Authorized Vendor
Space Heater has a master volume pot after the last coupling cap, so if you want to try adding an additional pull-down you can add it between lugs 1 and 2 of the volume pot.
Dan0h
Well-known member
After digging down it seems the pot should be doing that job already so I will pass on adding another resistor. It sounds like I need to check for DC leaks across the circuit and see where it’s coming from. I don’t think I put in any caps backwards but who knows. Last resort I have one of those cool Saturn works loop pedals I could just have the SH on that which would drop it in and out of the chain resolving the pop.
