I clonning Milbert BAM230/235 Car Tube Amplifier Supply - diyAudio
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Old 10th April 2006, 06:51 AM   #1
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Default I clonning Milbert BAM230/235 Car Tube Amplifier Supply

From my posted at Electronics and Tube forum

Where can I buy PQ35/35 FERRITE CORE POWER TRANSFORMER

and

Does anyone has MILBERT BAM230 TUBE CAR POWER AMPLIFIER

Now I succesfull for fixed my Milbert Car Tube Amplifier by changing PQ35/35 to EI40 choke & step-up ferrite core, I wondered about quality of new core.

I learning its operation and redesigning its PCB (some concept from my master : MR.DAVID LUMANAUW)

I decide for build new Tube CAR Amplifier with 20WATTS Single Ended Class-A : 211 TUBE.

If anybody interested please notice and look this post !!! I shall d o it !!!

Regard
analog guy
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Old 10th April 2006, 07:27 AM   #2
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Default My repair collection (Haaaa)

Left channel of BAM230,it used PCB from Bering EA-230 but Milbert had modified some value of input & phase spritter.
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Old 10th April 2006, 07:31 AM   #3
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Default My repair collection (Heeeee)

Right channel of BAM230.

As same as left channel.

12ax7 + 12at7 + 6sn7 + 6jn6
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Old 10th April 2006, 07:33 AM   #4
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Default Power Supply Section (Broken Core)

Now I changed PQ35/35 to EI40 (not in photo)

The best concept for me is
1.Carbon resistor for tube aplication
2.High FRQ core
3.Teflon insulated wire
4.Low current power amplifier
5.Electrocube Couping Capacitor (I seen in LAMM)
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Old 10th April 2006, 07:42 AM   #5
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Thumbs up BAM230 zoom out view

In my country : BAM230 it's about 650USD for 2nd hand market.

I seen some intested concept about HV supply for car tube amplifer but they're there's no (-)bias and filament supply on board, How about this concept ?

http://www.audiohobbyist.com/diypart...kit/carpsu.htm

Regard
analog guy
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Old 7th May 2006, 05:59 AM   #6
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Thumbs up This's Bottom Layer Pcb

I think it's quite complex PCB with output transformer included on PCB.

Could I use EL34 instead of 6JN6 ?

Now I can't drive 5.75" DYNAUDIO 15MA SPEAKER with MILBERT BAM-235, How do I modify this amp for this mission ?

Regard
ANALOG GUY
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Old 4th June 2008, 09:02 AM   #7
rush1 is offline rush1  Indonesia
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Default Re: I clonning Milbert BAM230/235 Car Tube Amplifier Supply

Quote:
Originally posted by ANALOG GUY
From my posted at Electronics and Tube forum

Where can I buy PQ35/35 FERRITE CORE POWER TRANSFORMER

and

Does anyone has MILBERT BAM230 TUBE CAR POWER AMPLIFIER

Now I succesfull for fixed my Milbert Car Tube Amplifier by changing PQ35/35 to EI40 choke & step-up ferrite core, I wondered about quality of new core.

I learning its operation and redesigning its PCB (some concept from my master : MR.DAVID LUMANAUW)

I decide for build new Tube CAR Amplifier with 20WATTS Single Ended Class-A : 211 TUBE.

If anybody interested please notice and look this post !!! I shall d o it !!!

Regard
analog guy
Whew, just found this thread, did you ever tried built the 211 tube car amplifier? I am interested in it.

Regards,
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Old 6th June 2008, 04:04 AM   #8
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My experience with 845 tubes is that the filiment is extremelt fragile while hot.

The 211 may be fragile as well.

6JN6 are very hardy, and inexpensive.

If you're building an amp from scratch for a car take a look at tubes that were used in avionics. Loctal base will help keep the tube seated.

John C.

Owner of 3 Milberts.
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Old 22nd December 2013, 03:40 PM   #9
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Hi Anolog, I am interested in cloning the amp, BAM-235, how can we do this? Thank you.
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