@WntrMute2 beautiful work. I have to transport mine hence a more sturdy build.
Hooked up the line stage to my sistem. Gain is just below the maximum acceptable treshold of 300B SE power amp, but its definetely a keeper, at least for a while. Will also try 4P1L and VT-25 on the same signal boards.
Hooked up the line stage to my sistem. Gain is just below the maximum acceptable treshold of 300B SE power amp, but its definetely a keeper, at least for a while. Will also try 4P1L and VT-25 on the same signal boards.
Attachments
Wonderful setup, thanks for sharing! Powder coated aluminum chassis? Color looks good with all the granite.
Using Colemans regulators the line stage is dead quiet. I previously was using LT1764 voltage regulator, which was good.. but nothing compared to the kit quality you get from Rod.
Its the first time I am participating and posting in any forum/community in my life. Though the last month of so I have learned a lot from this community members, to name a few @mogliaa @Rod Coleman @euro21 @andyjevans. Thank you for the unconditional support!
There is very little I can give back, but the best way I think of is uploading schematics, pictures and bills of materials for the build. Please take it with a pitch of salt - its not ideal/thoroughly reviewed, there is always an upgrade path to follow, the schematics are general and some component have been swapped along the way due to supply chain shortages or they have not arrived yet. The pricing is also very "generous", I expect somebody could build that with a good -30/50% off the price if schematics are optimized, shopping around, cheaper components, different part of the world, different tax/import duty situation etc. Hope somebody will find the document as useful as I found the manuals, bills of materials and illustrations prepared by others.
Original design of line stage and HT supply is by @mogliaa and it is implemented with minor modifications, LT supply schematics is from @Rod Coleman I included some of their illustrations to save time.
There is very little I can give back, but the best way I think of is uploading schematics, pictures and bills of materials for the build. Please take it with a pitch of salt - its not ideal/thoroughly reviewed, there is always an upgrade path to follow, the schematics are general and some component have been swapped along the way due to supply chain shortages or they have not arrived yet. The pricing is also very "generous", I expect somebody could build that with a good -30/50% off the price if schematics are optimized, shopping around, cheaper components, different part of the world, different tax/import duty situation etc. Hope somebody will find the document as useful as I found the manuals, bills of materials and illustrations prepared by others.
Original design of line stage and HT supply is by @mogliaa and it is implemented with minor modifications, LT supply schematics is from @Rod Coleman I included some of their illustrations to save time.
Landfall Chassis with DIY powder coat in green malachite hammertone. It was an attempt at a nod to Altec. Coleman regs are already built and on the shelf for the rebuild of the 300b. I slso used them on the 3C24 tubes with the Pete Millet DC boards for the driver tubes in the build I posted above.
I would like to modify this breadboard to test run CX301a.
My rough idea:
Change the R4 on the Bartola Gyrators to ~180-200k to lover the gyrator voltage for anode to + 90-100V
Change the R1 on the Coleman regulators to 4 ohms for regulators
Change the biasing either to 1.2k bypassed or 6x Cree diodes in line.
Other than that, the schematics are pretty similar... I might need to tweak the RAW RC voltages with some resistors too. Am I missing something?
My rough idea:
Change the R4 on the Bartola Gyrators to ~180-200k to lover the gyrator voltage for anode to + 90-100V
Change the R1 on the Coleman regulators to 4 ohms for regulators
Change the biasing either to 1.2k bypassed or 6x Cree diodes in line.
Other than that, the schematics are pretty similar... I might need to tweak the RAW RC voltages with some resistors too. Am I missing something?
