Quote from: teemuk on August 21, 2007, 04:47:25 AMThanks for the reply. The optocoupler has already been swapped in this amp. I rechecked the voltage to be sure and it is still at 28VDC. I'll go ahead and put an LM3875 in it and see what happens.
Supply voltages are definitely past the max ratings of the concerned TDA chip. Reputedly that amp will also suffer from problems with the optocoupler.
- Welcome to Solid State Guitar Amp Forum | DIY Guitar Amplifiers.
Solid State Guitar Amp Forum
News:
30% off all Honey Amp kits, check it out at https://store.ssguitar.com !
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
Pages1
#1
The Newcomer's Forum / Re: Swapping TDA2050 for LM3875 in Vox Cambridge 30
August 28, 2007, 03:28:50 AM #2
The Newcomer's Forum / Swapping TDA2050 for LM3875 in Vox Cambridge 30
August 20, 2007, 06:59:38 PM
Hi all. I have a Vox Cambridge 30 Twin Reverb. This amp has a TDA2050. I've read about people replacing the TDA2050 in this amp with an LM3875/LM3876/etc. Example:
http://voxman3.tripod.com/BobAmpPage.htm
I'm thinking about doing this. Anyone done this or know the motivation behind it?
I checked the TDA2050, and it's getting 28V right now. I think that may be too much for it, and hence why the LM3* chips would do better in this circuit. It seems odd to me that Vox would build them this way, but maybe I am missing something?
http://voxman3.tripod.com/BobAmpPage.htm
I'm thinking about doing this. Anyone done this or know the motivation behind it?
I checked the TDA2050, and it's getting 28V right now. I think that may be too much for it, and hence why the LM3* chips would do better in this circuit. It seems odd to me that Vox would build them this way, but maybe I am missing something?
Pages1